1 | <?php |
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2 | /*======================================================================= |
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3 | // File: JPGRAPH_UTILS.INC |
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4 | // Description: Collection of non-essential "nice to have" utilities |
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5 | // Created: 2005-11-20 |
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6 | // Ver: $Id: jpgraph_utils.inc.php 1777 2009-08-23 17:34:36Z ljp $ |
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7 | // |
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8 | // Copyright (c) Asial Corporation. All rights reserved. |
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9 | //======================================================================== |
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10 | */ |
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11 | |
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12 | //=================================================== |
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13 | // CLASS FuncGenerator |
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14 | // Description: Utility class to help generate data for function plots. |
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15 | // The class supports both parametric and regular functions. |
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16 | //=================================================== |
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17 | class FuncGenerator { |
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18 | private $iFunc='',$iXFunc='',$iMin,$iMax,$iStepSize; |
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19 | |
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20 | function __construct($aFunc,$aXFunc='') { |
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21 | $this->iFunc = $aFunc; |
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22 | $this->iXFunc = $aXFunc; |
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23 | } |
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24 | |
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25 | function E($aXMin,$aXMax,$aSteps=50) { |
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26 | $this->iMin = $aXMin; |
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27 | $this->iMax = $aXMax; |
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28 | $this->iStepSize = ($aXMax-$aXMin)/$aSteps; |
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29 | |
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30 | if( $this->iXFunc != '' ) |
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31 | $t = 'for($i='.$aXMin.'; $i<='.$aXMax.'; $i += '.$this->iStepSize.') {$ya[]='.$this->iFunc.';$xa[]='.$this->iXFunc.';}'; |
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32 | elseif( $this->iFunc != '' ) |
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33 | $t = 'for($x='.$aXMin.'; $x<='.$aXMax.'; $x += '.$this->iStepSize.') {$ya[]='.$this->iFunc.';$xa[]=$x;} $x='.$aXMax.';$ya[]='.$this->iFunc.';$xa[]=$x;'; |
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34 | else |
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35 | JpGraphError::RaiseL(24001);//('FuncGenerator : No function specified. '); |
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36 | |
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37 | @eval($t); |
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38 | |
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39 | // If there is an error in the function specifcation this is the only |
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40 | // way we can discover that. |
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41 | if( empty($xa) || empty($ya) ) |
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42 | JpGraphError::RaiseL(24002);//('FuncGenerator : Syntax error in function specification '); |
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43 | |
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44 | return array($xa,$ya); |
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45 | } |
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46 | } |
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47 | |
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48 | |
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49 | //============================================================================= |
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50 | // CLASS DateScaleUtils |
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51 | // Description: Help to create a manual date scale |
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52 | //============================================================================= |
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53 | define('DSUTILS_MONTH',1); // Major and minor ticks on a monthly basis |
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54 | define('DSUTILS_MONTH1',1); // Major and minor ticks on a monthly basis |
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55 | define('DSUTILS_MONTH2',2); // Major ticks on a bi-monthly basis |
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56 | define('DSUTILS_MONTH3',3); // Major icks on a tri-monthly basis |
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57 | define('DSUTILS_MONTH6',4); // Major on a six-monthly basis |
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58 | define('DSUTILS_WEEK1',5); // Major ticks on a weekly basis |
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59 | define('DSUTILS_WEEK2',6); // Major ticks on a bi-weekly basis |
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60 | define('DSUTILS_WEEK4',7); // Major ticks on a quod-weekly basis |
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61 | define('DSUTILS_DAY1',8); // Major ticks on a daily basis |
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62 | define('DSUTILS_DAY2',9); // Major ticks on a bi-daily basis |
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63 | define('DSUTILS_DAY4',10); // Major ticks on a qoud-daily basis |
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64 | define('DSUTILS_YEAR1',11); // Major ticks on a yearly basis |
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65 | define('DSUTILS_YEAR2',12); // Major ticks on a bi-yearly basis |
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66 | define('DSUTILS_YEAR5',13); // Major ticks on a five-yearly basis |
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67 | |
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68 | |
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69 | class DateScaleUtils { |
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70 | public static $iMin=0, $iMax=0; |
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71 | |
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72 | private static $starthour,$startmonth, $startday, $startyear; |
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73 | private static $endmonth, $endyear, $endday; |
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74 | private static $tickPositions=array(),$minTickPositions=array(); |
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75 | private static $iUseWeeks = true; |
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76 | |
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77 | static function UseWeekFormat($aFlg) { |
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78 | self::$iUseWeeks = $aFlg; |
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79 | } |
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80 | |
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81 | static function doYearly($aType,$aMinor=false) { |
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82 | $i=0; $j=0; |
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83 | $m = self::$startmonth; |
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84 | $y = self::$startyear; |
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85 | |
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86 | if( self::$startday == 1 ) { |
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87 | self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y); |
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88 | } |
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89 | ++$m; |
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90 | |
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91 | |
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92 | switch( $aType ) { |
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93 | case DSUTILS_YEAR1: |
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94 | for($y=self::$startyear; $y <= self::$endyear; ++$y ) { |
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95 | if( $aMinor ) { |
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96 | while( $m <= 12 ) { |
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97 | if( !($y == self::$endyear && $m > self::$endmonth) ) { |
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98 | self::$minTickPositions[$j++] = mktime(0,0,0,$m,1,$y); |
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99 | } |
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100 | ++$m; |
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101 | } |
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102 | $m=1; |
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103 | } |
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104 | self::$tickPositions[$i++] = mktime(0,0,0,1,1,$y); |
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105 | } |
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106 | break; |
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107 | case DSUTILS_YEAR2: |
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108 | $y=self::$startyear; |
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109 | while( $y <= self::$endyear ) { |
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110 | self::$tickPositions[$i++] = mktime(0,0,0,1,1,$y); |
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111 | for($k=0; $k < 1; ++$k ) { |
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112 | ++$y; |
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113 | if( $aMinor ) { |
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114 | self::$minTickPositions[$j++] = mktime(0,0,0,1,1,$y); |
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115 | } |
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116 | } |
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117 | ++$y; |
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118 | } |
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119 | break; |
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120 | case DSUTILS_YEAR5: |
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121 | $y=self::$startyear; |
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122 | while( $y <= self::$endyear ) { |
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123 | self::$tickPositions[$i++] = mktime(0,0,0,1,1,$y); |
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124 | for($k=0; $k < 4; ++$k ) { |
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125 | ++$y; |
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126 | if( $aMinor ) { |
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127 | self::$minTickPositions[$j++] = mktime(0,0,0,1,1,$y); |
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128 | } |
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129 | } |
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130 | ++$y; |
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131 | } |
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132 | break; |
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133 | } |
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134 | } |
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135 | |
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136 | static function doDaily($aType,$aMinor=false) { |
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137 | $m = self::$startmonth; |
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138 | $y = self::$startyear; |
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139 | $d = self::$startday; |
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140 | $h = self::$starthour; |
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141 | $i=0;$j=0; |
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142 | |
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143 | if( $h == 0 ) { |
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144 | self::$tickPositions[$i++] = mktime(0,0,0,$m,$d,$y); |
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145 | } |
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146 | $t = mktime(0,0,0,$m,$d,$y); |
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147 | |
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148 | switch($aType) { |
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149 | case DSUTILS_DAY1: |
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150 | while( $t <= self::$iMax ) { |
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151 | $t = strtotime('+1 day',$t); |
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152 | self::$tickPositions[$i++] = $t; |
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153 | if( $aMinor ) { |
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154 | self::$minTickPositions[$j++] = strtotime('+12 hours',$t); |
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155 | } |
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156 | } |
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157 | break; |
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158 | case DSUTILS_DAY2: |
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159 | while( $t <= self::$iMax ) { |
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160 | $t = strtotime('+1 day',$t); |
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161 | if( $aMinor ) { |
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162 | self::$minTickPositions[$j++] = $t; |
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163 | } |
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164 | $t = strtotime('+1 day',$t); |
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165 | self::$tickPositions[$i++] = $t; |
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166 | } |
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167 | break; |
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168 | case DSUTILS_DAY4: |
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169 | while( $t <= self::$iMax ) { |
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170 | for($k=0; $k < 3; ++$k ) { |
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171 | $t = strtotime('+1 day',$t); |
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172 | if( $aMinor ) { |
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173 | self::$minTickPositions[$j++] = $t; |
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174 | } |
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175 | } |
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176 | $t = strtotime('+1 day',$t); |
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177 | self::$tickPositions[$i++] = $t; |
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178 | } |
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179 | break; |
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180 | } |
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181 | } |
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182 | |
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183 | static function doWeekly($aType,$aMinor=false) { |
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184 | $hpd = 3600*24; |
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185 | $hpw = 3600*24*7; |
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186 | // Find out week number of min date |
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187 | $thursday = self::$iMin + $hpd * (3 - (date('w', self::$iMin) + 6) % 7); |
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188 | $week = 1 + (date('z', $thursday) - (11 - date('w', mktime(0, 0, 0, 1, 1, date('Y', $thursday)))) % 7) / 7; |
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189 | $daynumber = date('w',self::$iMin); |
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190 | if( $daynumber == 0 ) $daynumber = 7; |
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191 | $m = self::$startmonth; |
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192 | $y = self::$startyear; |
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193 | $d = self::$startday; |
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194 | $i=0;$j=0; |
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195 | // The assumption is that the weeks start on Monday. If the first day |
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196 | // is later in the week then the first week tick has to be on the following |
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197 | // week. |
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198 | if( $daynumber == 1 ) { |
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199 | self::$tickPositions[$i++] = mktime(0,0,0,$m,$d,$y); |
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200 | $t = mktime(0,0,0,$m,$d,$y) + $hpw; |
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201 | } |
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202 | else { |
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203 | $t = mktime(0,0,0,$m,$d,$y) + $hpd*(8-$daynumber); |
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204 | } |
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205 | |
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206 | switch($aType) { |
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207 | case DSUTILS_WEEK1: |
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208 | $cnt=0; |
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209 | break; |
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210 | case DSUTILS_WEEK2: |
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211 | $cnt=1; |
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212 | break; |
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213 | case DSUTILS_WEEK4: |
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214 | $cnt=3; |
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215 | break; |
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216 | } |
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217 | while( $t <= self::$iMax ) { |
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218 | self::$tickPositions[$i++] = $t; |
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219 | for($k=0; $k < $cnt; ++$k ) { |
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220 | $t += $hpw; |
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221 | if( $aMinor ) { |
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222 | self::$minTickPositions[$j++] = $t; |
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223 | } |
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224 | } |
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225 | $t += $hpw; |
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226 | } |
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227 | } |
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228 | |
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229 | static function doMonthly($aType,$aMinor=false) { |
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230 | $monthcount=0; |
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231 | $m = self::$startmonth; |
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232 | $y = self::$startyear; |
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233 | $i=0; $j=0; |
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234 | |
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235 | // Skip the first month label if it is before the startdate |
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236 | if( self::$startday == 1 ) { |
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237 | self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y); |
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238 | $monthcount=1; |
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239 | } |
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240 | if( $aType == 1 ) { |
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241 | if( self::$startday < 15 ) { |
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242 | self::$minTickPositions[$j++] = mktime(0,0,0,$m,15,$y); |
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243 | } |
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244 | } |
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245 | ++$m; |
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246 | |
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247 | // Loop through all the years included in the scale |
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248 | for($y=self::$startyear; $y <= self::$endyear; ++$y ) { |
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249 | // Loop through all the months. There are three cases to consider: |
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250 | // 1. We are in the first year and must start with the startmonth |
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251 | // 2. We are in the end year and we must stop at last month of the scale |
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252 | // 3. A year in between where we run through all the 12 months |
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253 | $stopmonth = $y == self::$endyear ? self::$endmonth : 12; |
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254 | while( $m <= $stopmonth ) { |
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255 | switch( $aType ) { |
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256 | case DSUTILS_MONTH1: |
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257 | // Set minor tick at the middle of the month |
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258 | if( $aMinor ) { |
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259 | if( $m <= $stopmonth ) { |
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260 | if( !($y==self::$endyear && $m==$stopmonth && self::$endday < 15) ) |
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261 | self::$minTickPositions[$j++] = mktime(0,0,0,$m,15,$y); |
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262 | } |
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263 | } |
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264 | // Major at month |
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265 | // Get timestamp of first hour of first day in each month |
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266 | self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y); |
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267 | |
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268 | break; |
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269 | case DSUTILS_MONTH2: |
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270 | if( $aMinor ) { |
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271 | // Set minor tick at start of each month |
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272 | self::$minTickPositions[$j++] = mktime(0,0,0,$m,1,$y); |
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273 | } |
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274 | |
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275 | // Major at every second month |
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276 | // Get timestamp of first hour of first day in each month |
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277 | if( $monthcount % 2 == 0 ) { |
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278 | self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y); |
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279 | } |
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280 | break; |
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281 | case DSUTILS_MONTH3: |
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282 | if( $aMinor ) { |
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283 | // Set minor tick at start of each month |
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284 | self::$minTickPositions[$j++] = mktime(0,0,0,$m,1,$y); |
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285 | } |
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286 | // Major at every third month |
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287 | // Get timestamp of first hour of first day in each month |
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288 | if( $monthcount % 3 == 0 ) { |
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289 | self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y); |
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290 | } |
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291 | break; |
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292 | case DSUTILS_MONTH6: |
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293 | if( $aMinor ) { |
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294 | // Set minor tick at start of each month |
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295 | self::$minTickPositions[$j++] = mktime(0,0,0,$m,1,$y); |
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296 | } |
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297 | // Major at every third month |
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298 | // Get timestamp of first hour of first day in each month |
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299 | if( $monthcount % 6 == 0 ) { |
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300 | self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y); |
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301 | } |
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302 | break; |
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303 | } |
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304 | ++$m; |
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305 | ++$monthcount; |
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306 | } |
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307 | $m=1; |
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308 | } |
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309 | |
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310 | // For the case where all dates are within the same month |
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311 | // we want to make sure we have at least two ticks on the scale |
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312 | // since the scale want work properly otherwise |
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313 | if(self::$startmonth == self::$endmonth && self::$startyear == self::$endyear && $aType==1 ) { |
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314 | self::$tickPositions[$i++] = mktime(0 ,0 ,0, self::$startmonth + 1, 1, self::$startyear); |
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315 | } |
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316 | |
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317 | return array(self::$tickPositions,self::$minTickPositions); |
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318 | } |
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319 | |
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320 | static function GetTicks($aData,$aType=1,$aMinor=false,$aEndPoints=false) { |
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321 | $n = count($aData); |
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322 | return self::GetTicksFromMinMax($aData[0],$aData[$n-1],$aType,$aMinor,$aEndPoints); |
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323 | } |
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324 | |
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325 | static function GetAutoTicks($aMin,$aMax,$aMaxTicks=10,$aMinor=false) { |
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326 | $diff = $aMax - $aMin; |
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327 | $spd = 3600*24; |
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328 | $spw = $spd*7; |
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329 | $spm = $spd*30; |
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330 | $spy = $spd*352; |
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331 | |
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332 | if( self::$iUseWeeks ) |
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333 | $w = 'W'; |
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334 | else |
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335 | $w = 'd M'; |
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336 | |
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337 | // Decision table for suitable scales |
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338 | // First value: Main decision point |
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339 | // Second value: Array of formatting depending on divisor for wanted max number of ticks. <divisor><formatting><format-string>,.. |
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340 | $tt = array( |
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341 | array($spw, array(1,DSUTILS_DAY1,'d M',2,DSUTILS_DAY2,'d M',-1,DSUTILS_DAY4,'d M')), |
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342 | array($spm, array(1,DSUTILS_DAY1,'d M',2,DSUTILS_DAY2,'d M',4,DSUTILS_DAY4,'d M',7,DSUTILS_WEEK1,$w,-1,DSUTILS_WEEK2,$w)), |
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343 | array($spy, array(1,DSUTILS_DAY1,'d M',2,DSUTILS_DAY2,'d M',4,DSUTILS_DAY4,'d M',7,DSUTILS_WEEK1,$w,14,DSUTILS_WEEK2,$w,30,DSUTILS_MONTH1,'M',60,DSUTILS_MONTH2,'M',-1,DSUTILS_MONTH3,'M')), |
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344 | array(-1, array(30,DSUTILS_MONTH1,'M-Y',60,DSUTILS_MONTH2,'M-Y',90,DSUTILS_MONTH3,'M-Y',180,DSUTILS_MONTH6,'M-Y',352,DSUTILS_YEAR1,'Y',704,DSUTILS_YEAR2,'Y',-1,DSUTILS_YEAR5,'Y'))); |
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345 | |
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346 | $ntt = count($tt); |
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347 | $nd = floor($diff/$spd); |
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348 | for($i=0; $i < $ntt; ++$i ) { |
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349 | if( $diff <= $tt[$i][0] || $i==$ntt-1) { |
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350 | $t = $tt[$i][1]; |
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351 | $n = count($t)/3; |
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352 | for( $j=0; $j < $n; ++$j ) { |
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353 | if( $nd/$t[3*$j] <= $aMaxTicks || $j==$n-1) { |
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354 | $type = $t[3*$j+1]; |
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355 | $fs = $t[3*$j+2]; |
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356 | list($tickPositions,$minTickPositions) = self::GetTicksFromMinMax($aMin,$aMax,$type,$aMinor); |
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357 | return array($fs,$tickPositions,$minTickPositions,$type); |
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358 | } |
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359 | } |
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360 | } |
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361 | } |
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362 | } |
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363 | |
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364 | static function GetTicksFromMinMax($aMin,$aMax,$aType,$aMinor=false,$aEndPoints=false) { |
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365 | self::$starthour = date('G',$aMin); |
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366 | self::$startmonth = date('n',$aMin); |
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367 | self::$startday = date('j',$aMin); |
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368 | self::$startyear = date('Y',$aMin); |
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369 | self::$endmonth = date('n',$aMax); |
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370 | self::$endyear = date('Y',$aMax); |
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371 | self::$endday = date('j',$aMax); |
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372 | self::$iMin = $aMin; |
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373 | self::$iMax = $aMax; |
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374 | |
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375 | if( $aType <= DSUTILS_MONTH6 ) { |
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376 | self::doMonthly($aType,$aMinor); |
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377 | } |
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378 | elseif( $aType <= DSUTILS_WEEK4 ) { |
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379 | self::doWeekly($aType,$aMinor); |
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380 | } |
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381 | elseif( $aType <= DSUTILS_DAY4 ) { |
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382 | self::doDaily($aType,$aMinor); |
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383 | } |
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384 | elseif( $aType <= DSUTILS_YEAR5 ) { |
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385 | self::doYearly($aType,$aMinor); |
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386 | } |
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387 | else { |
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388 | JpGraphError::RaiseL(24003); |
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389 | } |
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390 | // put a label at the very left data pos |
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391 | if( $aEndPoints ) { |
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392 | $tickPositions[$i++] = $aData[0]; |
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393 | } |
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394 | |
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395 | // put a label at the very right data pos |
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396 | if( $aEndPoints ) { |
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397 | $tickPositions[$i] = $aData[$n-1]; |
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398 | } |
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399 | |
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400 | return array(self::$tickPositions,self::$minTickPositions); |
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401 | } |
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402 | } |
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403 | |
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404 | //============================================================================= |
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405 | // Class ReadFileData |
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406 | //============================================================================= |
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407 | Class ReadFileData { |
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408 | //---------------------------------------------------------------------------- |
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409 | // Desciption: |
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410 | // Read numeric data from a file. |
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411 | // Each value should be separated by either a new line or by a specified |
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412 | // separator character (default is ','). |
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413 | // Before returning the data each value is converted to a proper float |
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414 | // value. The routine is robust in the sense that non numeric data in the |
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415 | // file will be discarded. |
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416 | // |
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417 | // Returns: |
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418 | // The number of data values read on success, FALSE on failure |
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419 | //---------------------------------------------------------------------------- |
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420 | static function FromCSV($aFile,&$aData,$aSepChar=',',$aMaxLineLength=1024) { |
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421 | $rh = @fopen($aFile,'r'); |
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422 | if( $rh === false ) { |
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423 | return false; |
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424 | } |
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425 | $tmp = array(); |
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426 | $lineofdata = fgetcsv($rh, 1000, ','); |
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427 | while ( $lineofdata !== FALSE) { |
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428 | $tmp = array_merge($tmp,$lineofdata); |
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429 | $lineofdata = fgetcsv($rh, $aMaxLineLength, $aSepChar); |
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430 | } |
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431 | fclose($rh); |
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432 | |
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433 | // Now make sure that all data is numeric. By default |
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434 | // all data is read as strings |
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435 | $n = count($tmp); |
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436 | $aData = array(); |
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437 | $cnt=0; |
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438 | for($i=0; $i < $n; ++$i) { |
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439 | if( $tmp[$i] !== "" ) { |
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440 | $aData[$cnt++] = floatval($tmp[$i]); |
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441 | } |
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442 | } |
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443 | return $cnt; |
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444 | } |
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445 | |
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446 | //---------------------------------------------------------------------------- |
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447 | // Desciption: |
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448 | // Read numeric data from a file. |
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449 | // Each value should be separated by either a new line or by a specified |
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450 | // separator character (default is ','). |
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451 | // Before returning the data each value is converted to a proper float |
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452 | // value. The routine is robust in the sense that non numeric data in the |
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453 | // file will be discarded. |
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454 | // |
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455 | // Options: |
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456 | // 'separator' => ',', |
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457 | // 'enclosure' => '"', |
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458 | // 'readlength' => 1024, |
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459 | // 'ignore_first' => false, |
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460 | // 'first_as_key' => false |
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461 | // 'escape' => '\', # PHP >= 5.3 only |
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462 | // |
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463 | // Returns: |
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464 | // The number of lines read on success, FALSE on failure |
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465 | //---------------------------------------------------------------------------- |
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466 | static function FromCSV2($aFile, &$aData, $aOptions = array()) { |
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467 | $aDefaults = array( |
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468 | 'separator' => ',', |
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469 | 'enclosure' => chr(34), |
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470 | 'escape' => chr(92), |
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471 | 'readlength' => 1024, |
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472 | 'ignore_first' => false, |
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473 | 'first_as_key' => false |
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474 | ); |
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475 | |
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476 | $aOptions = array_merge( |
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477 | $aDefaults, is_array($aOptions) ? $aOptions : array()); |
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478 | |
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479 | if( $aOptions['first_as_key'] ) { |
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480 | $aOptions['ignore_first'] = true; |
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481 | } |
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482 | |
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483 | $rh = @fopen($aFile, 'r'); |
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484 | |
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485 | if( $rh === false ) { |
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486 | return false; |
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487 | } |
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488 | |
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489 | $aData = array(); |
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490 | $aLine = fgetcsv($rh, |
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491 | $aOptions['readlength'], |
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492 | $aOptions['separator'], |
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493 | $aOptions['enclosure'] |
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494 | /*, $aOptions['escape'] # PHP >= 5.3 only */ |
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495 | ); |
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496 | |
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497 | // Use numeric array keys for the columns by default |
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498 | // If specified use first lines values as assoc keys instead |
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499 | $keys = array_keys($aLine); |
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500 | if( $aOptions['first_as_key'] ) { |
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501 | $keys = array_values($aLine); |
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502 | } |
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503 | |
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504 | $num_lines = 0; |
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505 | $num_cols = count($aLine); |
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506 | |
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507 | while ($aLine !== false) { |
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508 | if( is_array($aLine) && count($aLine) != $num_cols ) { |
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509 | JpGraphError::RaiseL(24004); |
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510 | // 'ReadCSV2: Column count mismatch in %s line %d' |
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511 | } |
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512 | |
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513 | // fgetcsv returns NULL for empty lines |
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514 | if( !is_null($aLine) ) { |
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515 | $num_lines++; |
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516 | |
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517 | if( !($aOptions['ignore_first'] && $num_lines == 1) && is_numeric($aLine[0]) ) { |
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518 | for( $i = 0; $i < $num_cols; $i++ ) { |
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519 | $aData[ $keys[$i] ][] = floatval($aLine[$i]); |
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520 | } |
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521 | } |
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522 | } |
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523 | |
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524 | $aLine = fgetcsv($rh, |
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525 | $aOptions['readlength'], |
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526 | $aOptions['separator'], |
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527 | $aOptions['enclosure'] |
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528 | /*, $aOptions['escape'] # PHP >= 5.3 only*/ |
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529 | ); |
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530 | } |
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531 | |
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532 | fclose($rh); |
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533 | |
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534 | if( $aOptions['ignore_first'] ) { |
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535 | $num_lines--; |
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536 | } |
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537 | |
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538 | return $num_lines; |
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539 | } |
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540 | |
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541 | // Read data from two columns in a plain text file |
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542 | static function From2Col($aFile, $aCol1, $aCol2, $aSepChar=' ') { |
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543 | $lines = @file($aFile,FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES); |
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544 | if( $lines === false ) { |
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545 | return false; |
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546 | } |
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547 | $s = '/[\s]+/'; |
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548 | if( $aSepChar == ',' ) { |
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549 | $s = '/[\s]*,[\s]*/'; |
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550 | } |
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551 | elseif( $aSepChar == ';' ) { |
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552 | $s = '/[\s]*;[\s]*/'; |
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553 | } |
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554 | foreach( $lines as $line => $datarow ) { |
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555 | $split = preg_split($s,$datarow); |
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556 | $aCol1[] = floatval(trim($split[0])); |
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557 | $aCol2[] = floatval(trim($split[1])); |
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558 | } |
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559 | |
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560 | return count($lines); |
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561 | } |
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562 | |
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563 | // Read data from one columns in a plain text file |
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564 | static function From1Col($aFile, $aCol1) { |
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565 | $lines = @file($aFile,FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES); |
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566 | if( $lines === false ) { |
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567 | return false; |
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568 | } |
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569 | foreach( $lines as $line => $datarow ) { |
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570 | $aCol1[] = floatval(trim($datarow)); |
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571 | } |
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572 | |
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573 | return count($lines); |
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574 | } |
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575 | |
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576 | static function FromMatrix($aFile,$aSepChar=' ') { |
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577 | $lines = @file($aFile,FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES); |
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578 | if( $lines === false ) { |
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579 | return false; |
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580 | } |
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581 | $mat = array(); |
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582 | $reg = '/'.$aSepChar.'/'; |
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583 | foreach( $lines as $line => $datarow ) { |
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584 | $row = preg_split($reg,trim($datarow)); |
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585 | foreach ($row as $key => $cell ) { |
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586 | $row[$key] = floatval(trim($cell)); |
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587 | } |
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588 | $mat[] = $row; |
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589 | } |
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590 | return $mat; |
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591 | } |
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592 | |
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593 | |
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594 | } |
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595 | |
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596 | define('__LR_EPSILON', 1.0e-8); |
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597 | //============================================================================= |
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598 | // Class LinearRegression |
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599 | //============================================================================= |
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600 | class LinearRegression { |
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601 | private $ix=array(),$iy=array(); |
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602 | private $ib=0, $ia=0; |
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603 | private $icalculated=false; |
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604 | public $iDet=0, $iCorr=0, $iStdErr=0; |
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605 | |
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606 | public function __construct($aDataX,$aDataY) { |
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607 | if( count($aDataX) !== count($aDataY) ) { |
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608 | JpGraph::Raise('LinearRegression: X and Y data array must be of equal length.'); |
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609 | } |
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610 | $this->ix = $aDataX; |
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611 | $this->iy = $aDataY; |
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612 | } |
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613 | |
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614 | public function Calc() { |
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615 | |
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616 | $this->icalculated = true; |
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617 | |
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618 | $n = count($this->ix); |
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619 | $sx2 = 0 ; |
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620 | $sy2 = 0 ; |
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621 | $sxy = 0 ; |
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622 | $sx = 0 ; |
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623 | $sy = 0 ; |
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624 | |
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625 | for( $i=0; $i < $n; ++$i ) { |
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626 | $sx2 += $this->ix[$i] * $this->ix[$i]; |
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627 | $sy2 += $this->iy[$i] * $this->iy[$i]; |
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628 | $sxy += $this->ix[$i] * $this->iy[$i]; |
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629 | $sx += $this->ix[$i]; |
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630 | $sy += $this->iy[$i]; |
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631 | } |
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632 | |
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633 | if( $n*$sx2 - $sx*$sx > __LR_EPSILON ) { |
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634 | $this->ib = ($n*$sxy - $sx*$sy) / ( $n*$sx2 - $sx*$sx ); |
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635 | $this->ia = ( $sy - $this->ib*$sx ) / $n; |
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636 | |
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637 | $sx = $this->ib * ( $sxy - $sx*$sy/$n ); |
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638 | $sy2 = $sy2 - $sy*$sy/$n; |
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639 | $sy = $sy2 - $sx; |
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640 | |
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641 | $this->iDet = $sx / $sy2; |
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642 | $this->iCorr = sqrt($this->iDet); |
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643 | if( $n > 2 ) { |
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644 | $this->iStdErr = sqrt( $sy / ($n-2) ); |
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645 | } |
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646 | else { |
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647 | $this->iStdErr = NAN ; |
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648 | } |
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649 | } |
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650 | else { |
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651 | $this->ib = 0; |
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652 | $this->ia = 0; |
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653 | } |
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654 | |
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655 | } |
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656 | |
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657 | public function GetAB() { |
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658 | if( $this->icalculated == false ) |
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659 | $this->Calc(); |
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660 | return array($this->ia, $this->ib); |
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661 | } |
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662 | |
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663 | public function GetStat() { |
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664 | if( $this->icalculated == false ) |
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665 | $this->Calc(); |
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666 | return array($this->iStdErr, $this->iCorr, $this->iDet); |
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667 | } |
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668 | |
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669 | public function GetY($aMinX, $aMaxX, $aStep=1) { |
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670 | if( $this->icalculated == false ) |
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671 | $this->Calc(); |
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672 | |
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673 | $yy = array(); |
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674 | $i = 0; |
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675 | for( $x=$aMinX; $x <= $aMaxX; $x += $aStep ) { |
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676 | $xx[$i ] = $x; |
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677 | $yy[$i++] = $this->ia + $this->ib * $x; |
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678 | } |
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679 | |
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680 | return array($xx,$yy); |
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681 | } |
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682 | |
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683 | } |
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684 | |
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685 | ?> |
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