1 | c++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++* |
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2 | DOUBLE PRECISION FUNCTION GPINDP(A,B,EPSIN,EPSOUT,FUNC,IOP) |
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3 | C from cernlib |
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4 | C PARAMETERS |
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5 | C |
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6 | C A = LOWER BOUNDARY |
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7 | C B = UPPER BOUNDARY |
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8 | C EPSIN = ACCURACY REQUIRED FOR THE APPROXINATION |
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9 | C EPSOUT = IMPROVED ERROR ESTIMATE FOR THE APPROXIMATION |
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10 | C FUNC = FUNCTION ROUTINE FOR THE FUNCTION FUNC(X).TO BE DE- |
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11 | C CLARED EXTERNAL IN THE CALLING ROUTINE |
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12 | C IOP = OPTION PARAMETER , IOP=1 , MODIFIED ROMBERG ALGORITHM, |
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13 | C ORDINARY CASE |
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14 | C IOP=2 , MODIFIED ROMBERG ALGORITHM, |
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15 | C COSINE TRANSFORMED CASE |
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16 | C IOP=3 , MODIFIED CLENSHAW-CURTIS AL |
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17 | C GORITHM |
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18 | C |
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19 | C PARAMETERS IN COMMON BLOCK / GPINT / |
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20 | C |
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21 | C TEND = UPPER BOUND FOR VALUE OF INTEGRAL |
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22 | C UMID = LOWER BOUND FOR VALUE OF INTEGRALC |
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23 | C N = THE NUMBER OF INTEGRAND VALUES USED IN THE CALCULATION |
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24 | C LINE = LINE NO IN ROMBERG TABLE (RELATED TO N THROUGH |
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25 | C N-1=2**(LINE-1) , APPLICABLE ONLY FOR IOP=1 OR 2) |
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26 | C IOUT = ELEMENT NO IN LINE (APPLICABLE ONLY FOR IOP=1 OR 2) |
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27 | C JOP = OPTION PARAMETER , JOP=0 , NO PRINTING OF INTERMEDIATE |
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28 | C CALCULATIONS |
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29 | C JOP=1 , PRINT INTERMEDIATE CALCULA- |
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30 | C TIONS |
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31 | C KOP = OPTION PARAMETER , KOP=0 , NO TIME ESTIMATE |
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32 | C KOP=1 , ESTIMATE TIME |
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33 | C T = TIME USED FOR CALCULATION IN MSEC. |
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34 | C |
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35 | C INTEGRATION PARAMETERS |
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36 | C |
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37 | C NUPPER = 9 , CORRESPONDS TO 1024 SUB-INTERVALS FOR THE UNFOLDED |
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38 | C INTEGRAL.THE MAX.NO OF FUNCTION EVALUATIONS THUS BEEING |
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39 | C 1025.THE HIGHEST END-POINT APPROXIMATION IS THUS USING |
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40 | C 1024 INTERVALS WHILE THE HIGHEST MID-POINT APPROXIMA- |
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41 | C TION IS USING 512 INTERVALS. |
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42 | C |
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43 | C INPUT/OUTPUT PARAMETERS |
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44 | C |
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45 | EXTERNAL FUNC |
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46 | DOUBLE PRECISION A,B,EPSIN,EPSOUT,BOUND,FUNC |
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47 | C |
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48 | C INTERNAL ARRAYS |
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49 | C |
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50 | DOUBLE PRECISION ACOF(513),BCOF(513),CCOF(1025) |
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51 | C |
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52 | C CONSTANTS IN DATA STATEMENTS |
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53 | C |
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54 | C*NS DOUBLE PRECISION ZERO,FOURTH,HALF,ONE,TWO,THREE,FOUR,FAC1,FAC2,PI, |
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55 | C*NS 1RANDER |
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56 | DOUBLE PRECISION ZERO,FOURTH,HALF,ONE,TWO, FOUR,FAC1,FAC2,PI |
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57 | C |
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58 | C VARIABLES DEPENDING ON STEPSIZE |
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59 | C |
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60 | DOUBLE PRECISION ALF,BET,RN,HNSTEP,TEND,UMID,WMEAN,DELN,TNEW,AR |
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61 | C |
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62 | C CONSTANTS RELATED TO CALCULATION OF TRIGONOMETRIC FUNCTIONS |
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63 | C |
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64 | DOUBLE PRECISION TRIARG,ALFN0,BETN0,GAMMAN,DELTAN,ALFNJ,BETNJ,ETAN |
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65 | 1K,KSINK |
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66 | C |
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67 | C OTHER VARIABLES USED |
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68 | C |
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69 | C*NS DOUBLE PRECISION CONST1,CONST2,XPLUS,XMIN,ERROR,RK,A0,A1,A2,COF,FA |
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70 | C*NS 1CTOR,ENDPTS |
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71 | DOUBLE PRECISION CONST1,CONST2,XPLUS,XMIN, RK,A0,A1,A2,COF,FA |
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72 | 1CTOR,ENDPTS |
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73 | C |
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74 | COMMON /GPINT/ TEND, UMID, N, LINE, IOUT, JOP, KOP, T |
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75 | DATA ZERO,FOURTH,HALF,ONE,TWO,FOUR/0.D0,.25D0,.5D0,1.D0,2.D0,4.D0/ |
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76 | DATA PI,FAC1,FAC2/3.141592653589793238462643383279D0,.411233516712 |
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77 | 1056609118103791649D0,.822467033424113218236207583298D0/ |
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78 | C |
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79 | DATA NUPPER/9/ |
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80 | C |
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81 | C TIMEX(T) IS A LIBRARY SUBROUTINE GIVING THE ELAPSED CP TIME |
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82 | C |
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83 | IF(KOP .NE. 0) T=1000.*T |
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84 | C |
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85 | C INITIAL CALCULATIONS |
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86 | C |
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87 | ALF=HALF*(B-A) |
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88 | BET=HALF*(B+A) |
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89 | CONST1=FUNC(A)+FUNC(B) |
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90 | CONST2=FUNC(BET) |
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91 | HNSTEP=TWO |
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92 | IF(IOP.EQ.2) HNSTEP=PI |
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93 | C |
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94 | IF(IOP.GT.1) GOTO 10 |
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95 | C |
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96 | C MODIFIED ROMBERG ALGORITHM,ORDINARY CASE |
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97 | C |
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98 | BCOF(1)=HNSTEP*CONST2 |
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99 | ACOF(1)=HALF*(CONST1+BCOF(1)) |
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100 | FACTOR=ONE |
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101 | ACOF(2)=ACOF(1)-(ACOF(1)-BCOF(1))/(FOUR*FACTOR-ONE) |
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102 | GOTO 30 |
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103 | C |
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104 | 10 IF(IOP.GT.2) GOTO 20 |
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105 | C |
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106 | C MODIFIED ROMBERG ALGORITHM,COSINE TRANSFORMED CASE |
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107 | C |
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108 | AR=FAC1 |
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109 | ENDPTS=CONST1 |
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110 | ACOF(1)=FAC2*CONST1 |
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111 | BCOF(1)=HNSTEP*CONST2-AR*CONST1 |
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112 | FACTOR=FOUR |
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113 | ACOF(1)=HALF*(ACOF(1)+BCOF(1)) |
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114 | ACOF(2)=ACOF(1)-(ACOF(1)-BCOF(1))/(FOUR*FACTOR-ONE) |
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115 | AR=FOURTH*AR |
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116 | GOTO 30 |
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117 | C |
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118 | 20 CONST1=HALF*CONST1 |
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119 | ACOF(1)=HALF*(CONST1+CONST2) |
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120 | ACOF(2)=HALF*(CONST1-CONST2) |
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121 | BCOF(2)=ACOF(2) |
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122 | TEND=TWO*(ACOF(1)-ACOF(2)/(ONE+TWO)) |
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123 | C |
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124 | C MODIFIED CLENSHAW-CURTIS ALGORITHM |
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125 | C |
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126 | 30 HNSTEP=HALF*HNSTEP |
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127 | NHALF=1 |
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128 | N=2 |
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129 | RN=TWO |
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130 | C |
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131 | IF(IOP.NE.1) THEN |
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132 | C |
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133 | C INITIAL PARAMETERS SPECIAL FOR THE MODIFIED ROMBERG ALGORITHM, |
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134 | C COSINE TRANSFORMED CASE AND THE MODIFIED CLENSHAW-CURTIS ALGORITHM |
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135 | C |
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136 | TRIARG=FOURTH*PI |
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137 | ALFN0=-ONE |
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138 | ENDIF |
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139 | C |
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140 | C END OF INITIAL CALCULATIONS |
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141 | C |
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142 | C START ACTUAL CALCULATION |
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143 | C |
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144 | C--- Transform this DO-loop into a GOTO to avoid illegal jumps into it |
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145 | C |
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146 | C DO 350 I=1,NUPPER |
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147 | I=0 |
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148 | 41 I=I+1 |
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149 | IF(I.GT.NUPPER) GOTO 350 |
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150 | LINE=I+2 |
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151 | C |
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152 | IF(IOP.GT.1) GOTO 60 |
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153 | C |
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154 | C MODIFIED ROMBERG ALGORITHM,ORDINARY CASE |
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155 | C |
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156 | C COMPUTE FIRST ELEMENT IN MID-POINT FORMULA FOR ORDINARY CASE |
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157 | C |
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158 | UMID=ZERO |
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159 | ALFNJ=HALF*HNSTEP |
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160 | DO 50 J=1,NHALF |
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161 | XPLUS=ALF*ALFNJ+BET |
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162 | XMIN=-ALF*ALFNJ+BET |
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163 | UMID=UMID+FUNC(XPLUS)+FUNC(XMIN) |
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164 | ALFNJ=ALFNJ+HNSTEP |
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165 | 50 CONTINUE |
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166 | UMID=HNSTEP*UMID |
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167 | GOTO 100 |
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168 | C |
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169 | C COMPUTE FUNCTION VALUES FOR MODIFIED ROMBERG ALGORITHM,COSINE |
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170 | C TRANSFORMED CASE AND MODIFIED CLENSHAW-CURTIS ALGORITHM |
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171 | C |
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172 | 60 CONST1=-SIN(TRIARG) |
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173 | CONST2=HALF*ALFN0/CONST1 |
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174 | IF(IOP.EQ.2) ETANK=CONST2 |
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175 | ALFN0=CONST1 |
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176 | BETN0=CONST2 |
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177 | GAMMAN=ONE-TWO*ALFN0**2 |
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178 | DELTAN=-TWO*ALFN0*BETN0 |
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179 | C |
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180 | DO 70 J=1,NHALF |
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181 | ALFNJ=GAMMAN*CONST1+DELTAN*CONST2 |
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182 | BETNJ=GAMMAN*CONST2-DELTAN*CONST1 |
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183 | XPLUS=ALF*ALFNJ+BET |
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184 | XMIN=-ALF*ALFNJ+BET |
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185 | CCOF(J)=FUNC(XPLUS)+FUNC(XMIN) |
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186 | CONST1=ALFNJ |
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187 | CONST2=BETNJ |
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188 | 70 CONTINUE |
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189 | C |
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190 | IF(IOP.EQ.3) GOTO 190 |
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191 | C |
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192 | C COMPUTE FIRST ELEMENT IN MID-POINT FORMULA FOR COSINE TRANSFORMED |
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193 | C ROMBERG ALGORITHM |
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194 | C |
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195 | NCOF=NHALF-1 |
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196 | COF=TWO*(TWO*ETANK**2-ONE) |
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197 | A2=ZERO |
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198 | A1=ZERO |
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199 | A0=CCOF(NHALF) |
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200 | IF(NCOF.EQ.0) GOTO 90 |
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201 | DO 80 J=1,NCOF |
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202 | A2=A1 |
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203 | A1=A0 |
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204 | INDEX=NHALF-J |
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205 | A0=CCOF(INDEX)+COF*A1-A2 |
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206 | 80 CONTINUE |
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207 | 90 UMID=HNSTEP*(A0-A1)*ETANK-AR*ENDPTS |
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208 | AR=FOURTH*AR |
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209 | C |
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210 | C MODIFIED ROMBERG ALGORITHM,CALCULATE (I+1)-TH ROW IN U-TABLE |
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211 | C |
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212 | 100 CONST1=FOUR*FACTOR |
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213 | INDEX=I+1 |
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214 | DO 110 J=2,INDEX |
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215 | TEND=UMID+(UMID-BCOF(J-1))/(CONST1-ONE) |
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216 | BCOF(J-1)=UMID |
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217 | UMID=TEND |
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218 | CONST1=FOUR*CONST1 |
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219 | 110 CONTINUE |
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220 | BCOF(INDEX)=TEND |
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221 | XPLUS=CONST1 |
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222 | C |
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223 | C CALCULATION OF (I+1)-TH ROW IN U-TABLE FINISHED |
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224 | C |
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225 | C PRINT INTERMEDIATE RESULTS IF WANTED |
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226 | C |
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227 | IF(JOP.EQ.0) GOTO 120 |
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228 | C |
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229 | ICHECK=0 |
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230 | ASSIGN 120 TO JUMP |
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231 | GOTO 360 |
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232 | C |
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233 | C TEST IF REQUIRED ACCURACY IS OBTAINED |
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234 | C |
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235 | 120 EPSOUT=ONE |
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236 | IOUT=1 |
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237 | DO 140 J=1,INDEX |
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238 | CONST1=HALF*(ACOF(J)+BCOF(J)) |
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239 | CONST2=HALF*ABS((ACOF(J)-BCOF(J))/CONST1) |
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240 | IF(CONST2.GT.EPSOUT) GOTO 130 |
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241 | EPSOUT=CONST2 |
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242 | IOUT=J |
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243 | 130 ACOF(J)=CONST1 |
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244 | 140 CONTINUE |
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245 | C |
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246 | C TESTING ON ACCURACY FINISHED |
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247 | C |
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248 | IF(IOUT.EQ.INDEX) IOUT=IOUT+1 |
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249 | ACOF(INDEX+1)=ACOF(INDEX)-(ACOF(INDEX)-BCOF(INDEX))/(XPLUS-ONE) |
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250 | C |
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251 | IF(EPSOUT.GT.EPSIN) GOTO 340 |
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252 | C |
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253 | C CALCULATION FOR MODIFIED ROMBERG ALGORITHM FINISHED |
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254 | C |
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255 | 150 N=2*N |
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256 | C |
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257 | C PRINT INTERMEDIATE RESULTS IF WANTED |
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258 | C |
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259 | IF(JOP.EQ.0) GOTO 170 |
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260 | C |
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261 | ICHECK=1 |
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262 | INDEX=INDEX+1 |
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263 | ASSIGN 160 TO JUMP |
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264 | GOTO 360 |
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265 | C |
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266 | 160 INDEX=INDEX-1 |
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267 | C |
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268 | 170 N=N+1 |
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269 | J=IOUT |
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270 | IF((J-1).LT.INDEX) GOTO 180 |
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271 | J=INDEX |
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272 | 180 TEND=ALF*(TWO*ACOF(J)-BCOF(J)) |
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273 | UMID=ALF*BCOF(J) |
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274 | GPINDP=ALF*ACOF(IOUT) |
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275 | C |
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276 | GOTO 310 |
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277 | C |
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278 | C START CALCULATION FOR MODIFIED CLENSHAW-CURTIS ALGORITHM |
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279 | C |
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280 | 190 BCOF(1)=ZERO |
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281 | DO 200 J=1,NHALF |
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282 | BCOF(1)=BCOF(1)+CCOF(J) |
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283 | 200 CONTINUE |
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284 | BCOF(1)=HALF*HNSTEP*BCOF(1) |
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285 | C |
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286 | C CALCULATION OF FIRST B-COEFFICIENT FINISHED.COMPUTE THE HIGHER |
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287 | C COEFFICIENTS IF NHALF GREATER THAN ONE |
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288 | C |
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289 | IF(NHALF.EQ.1) GOTO 230 |
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290 | C |
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291 | CONST1=ONE |
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292 | CONST2=ZERO |
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293 | NCOF=NHALF-1 |
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294 | KSIGN=-1 |
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295 | DO 220 K=1,NCOF |
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296 | C |
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297 | C COMPUTE TRIGONOMETRIC SUM FOR B-COEFFICIENT |
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298 | C |
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299 | ETANK=GAMMAN*CONST1-DELTAN*CONST2 |
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300 | KSINK=GAMMAN*CONST2+DELTAN*CONST1 |
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301 | COF=TWO*(TWO*ETANK**2-ONE) |
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302 | A2=ZERO |
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303 | A1=ZERO |
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304 | A0=CCOF(NHALF) |
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305 | DO 210 J=1,NCOF |
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306 | A2=A1 |
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307 | A1=A0 |
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308 | INDEX=NHALF-J |
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309 | A0=CCOF(INDEX)+COF*A1-A2 |
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310 | 210 CONTINUE |
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311 | C |
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312 | BCOF(K+1)=HNSTEP*(A0-A1)*ETANK |
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313 | IF(KSIGN.EQ.-1) BCOF(K+1)=-BCOF(K+1) |
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314 | KSIGN=-KSIGN |
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315 | C |
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316 | CONST1=ETANK |
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317 | CONST2=KSINK |
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318 | C |
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319 | 220 CONTINUE |
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320 | C |
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321 | C CALCULATION OF B-COEFFICIENTS FINISHED |
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322 | C |
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323 | C COMPUTE NEW MODIFIED MID-POINT APPROXIMATION WHEN THE INTERVAL |
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324 | C OF INTEGRATION IS DIVIDED IN N EQUAL SUB INTERVALS |
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325 | C |
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326 | 230 UMID=ZERO |
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327 | RK=RN |
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328 | NN=NHALF+1 |
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329 | DO 240 K=1,NN |
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330 | INDEX=NN+1-K |
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331 | UMID=UMID+BCOF(INDEX)/(RK**2-ONE) |
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332 | RK=RK-TWO |
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333 | 240 CONTINUE |
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334 | UMID=-TWO*UMID |
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335 | C |
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336 | C COMPUTE NEW C-COEFFICIENTS FOR END-POINT APPROXIMATION |
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337 | C |
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338 | NN=N+2 |
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339 | DO 250 J=1,NHALF |
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340 | INDEX=NN-J |
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341 | CCOF(J)=HALF*(ACOF(J)+BCOF(J)) |
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342 | CCOF(INDEX)=HALF*(ACOF(J)-BCOF(J)) |
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343 | 250 CONTINUE |
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344 | INDEX=NHALF+1 |
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345 | CCOF(INDEX)=ACOF(INDEX) |
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346 | C |
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347 | C CALCULATION OF NEW COEFFICIENTS FINISHED |
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348 | C |
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349 | C COMPUTE NEW END-POINT APPROXIMATION WHEN THE INTERVAL OF INTEGRA- |
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350 | C TION IS DIVIDED IN 2N EQUAL SUB INTERVALS |
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351 | C |
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352 | WMEAN=HALF*(TEND+UMID) |
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353 | BOUND=HALF*(TEND-UMID) |
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354 | C |
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355 | DELN=ZERO |
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356 | RK=TWO*RN |
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357 | DO 260 J=1,NHALF |
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358 | INDEX=N+2-J |
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359 | DELN=DELN+CCOF(INDEX)/(RK**2-ONE) |
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360 | RK=RK-TWO |
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361 | 260 CONTINUE |
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362 | DELN=-TWO*DELN |
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363 | C |
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364 | C PRINT INTERMEDIATE RESULTS IF WANTED |
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365 | C |
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366 | IF(JOP.EQ.0) GOTO 270 |
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367 | C |
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368 | GOTO 400 |
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369 | C |
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370 | C PRINTING OF INTERMEDIATE RESULTS FINISHED |
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371 | C |
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372 | 270 TNEW=WMEAN+DELN |
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373 | EPSOUT=ABS(BOUND/TNEW) |
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374 | C |
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375 | IF(EPSOUT.GT.EPSIN) GOTO 320 |
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376 | C |
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377 | C REQUIRED ACCURACY OBTAINED |
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378 | C |
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379 | 280 N=2*N+1 |
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380 | C |
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381 | C*UL 290 TEND=ALF*(TEND+DELN) |
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382 | TEND=ALF*(TEND+DELN) |
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383 | UMID=ALF*(UMID+DELN) |
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384 | C |
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385 | C*UL 300 GPINDP=ALF*TNEW |
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386 | GPINDP=ALF*TNEW |
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387 | C |
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388 | 310 IF(KOP.EQ.0) GOTO 315 |
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389 | c CALL TIMEX ( T) |
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390 | T=1000.*T |
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391 | C |
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392 | 315 RETURN |
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393 | C |
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394 | 320 DO 330 J=1,N |
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395 | ACOF(J)=CCOF(J) |
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396 | 330 CONTINUE |
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397 | ACOF(N+1)=CCOF(N+1) |
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398 | BCOF(N+1)=CCOF(N+1) |
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399 | TEND=TNEW |
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400 | C |
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401 | 340 NHALF=N |
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402 | N=2*N |
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403 | RN=TWO*RN |
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404 | HNSTEP=HALF*HNSTEP |
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405 | IF(IOP.GT.1) TRIARG=HALF*TRIARG |
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406 | C |
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407 | GOTO 41 |
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408 | 350 CONTINUE |
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409 | C |
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410 | C REQUIRED ACCURACY OF INTEGRAL NOT OBTAINED |
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411 | C |
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412 | N=NHALF |
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413 | RN=HALF*RN |
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414 | C |
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415 | IF(IOP.LT.3) GOTO 150 |
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416 | C |
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417 | TEND=TWO*(TNEW-DELN)-UMID |
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418 | C |
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419 | GOTO 280 |
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420 | C PRINT INTERMEDIATE RESULTS FOR THE MODIFIED ROMBERG ALGORITHM |
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421 | C |
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422 | 360 IF((N.NE.2).AND.(N.NE.256)) GOTO 370 |
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423 | IF(N.EQ.256) WRITE(6,460) |
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424 | WRITE(6,420) |
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425 | 370 DO 390 J=1,INDEX |
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426 | CONST1=ALF*ACOF(J) |
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427 | IF(ICHECK.EQ.1) GOTO 380 |
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428 | CONST2=ALF*BCOF(J) |
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429 | IF(J.EQ.1) WRITE(6,430) N,J,CONST1,CONST2 |
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430 | IF(J.GT.1) WRITE(6,440) J,CONST1,CONST2 |
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431 | GOTO 390 |
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432 | C |
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433 | 380 IF(J.EQ.1) WRITE(6,430) N,J,CONST1 |
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434 | IF(J.GT.1) WRITE(6,440) J,CONST1 |
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435 | 390 CONTINUE |
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436 | GOTO JUMP,(120,160) |
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437 | C |
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438 | C PRINTING FINISHED FOR THE MODIFIED ROMBERG ALGORITHM |
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439 | C |
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440 | C PRINT INTERMEDIATE RESULTS FOR THE MODIFIED CLENSHAW-CURTIS AL- |
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441 | C GORITHM |
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442 | C |
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443 | 400 A0=ALF*TEND |
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444 | A1=ALF*WMEAN |
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445 | A2=ALF*UMID |
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446 | CONST1=ALF*BOUND |
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447 | CONST2=ALF*DELN |
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448 | C |
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449 | IF(N.GT.2) GOTO 410 |
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450 | C |
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451 | WRITE(6,470) |
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452 | 410 WRITE(6,480) N,A0 |
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453 | WRITE(6,490) A1,CONST2,CONST1 |
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454 | WRITE(6,490) A2 |
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455 | GOTO 270 |
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456 | C |
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457 | C PRINTING FINISHED FOR THE MODIFIED CLENSHAW-CURTIS ALGORITHM |
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458 | C |
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459 | 420 FORMAT(/,8X,'N',3X,'J',19X,'TEND(J)',34X,'UMID(J)',/) |
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460 | 430 FORMAT(5X,I4,2X,I2,4X,D36.29,5X,D36.29) |
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461 | 440 FORMAT(11X,I2,4X,D36.29,5X,D36.29) |
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462 | 450 FORMAT(/) |
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463 | 460 FORMAT('1'////) |
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464 | 470 FORMAT(6X,'N',17X,'TEND ',/,20X,'(TEND+UMID)/2',28X,'DELN',34X, |
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465 | 1 '(TEND-UMID)/2'/24X,'UMID') |
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466 | 480 FORMAT(/,4X,I3,2X,D36.29) |
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467 | 490 FORMAT(9X,D36.29,3X,D36.29,3X,D36.29) |
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468 | END |
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469 | c++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++* |
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