1 | /* CavityPass.c |
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2 | Accelerator Toolbox |
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3 | Revision 3/10/04 |
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4 | A.Terebilo terebilo@ssrl.slac.stanford.edu |
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5 | */ |
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6 | |
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7 | #include "mex.h" |
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8 | #include "elempass.h" |
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9 | #include <math.h> |
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10 | #define TWOPI 6.28318530717959 |
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11 | #define C0 2.99792458e8 |
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12 | |
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13 | |
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14 | void CavityPass(double *r_in, double le, double nv, double freq, double lag, int num_particles) |
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15 | /* le - physical length |
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16 | nv - peak voltage (V) normalized to the design enegy (eV) |
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17 | r is a 6-by-N matrix of initial conditions reshaped into |
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18 | 1-d array of 6*N elements |
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19 | */ |
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20 | { int c, c6; |
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21 | double halflength , p_norm, NormL; |
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22 | if(le == 0) |
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23 | { for(c = 0;c<num_particles;c++) |
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24 | { c6 = c*6; |
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25 | if(!mxIsNaN(r_in[c6])) |
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26 | r_in[c6+4] += -nv*sin(TWOPI*freq*(r_in[c6+5]-lag)/C0); |
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27 | } |
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28 | } |
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29 | else |
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30 | { halflength = le/2; |
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31 | for(c = 0;c<num_particles;c++) |
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32 | { c6 = c*6; |
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33 | if(!mxIsNaN(r_in[c6])) |
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34 | { p_norm = 1/(1+r_in[c6+4]); |
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35 | NormL = halflength*p_norm; |
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36 | /* Prropagate through a drift equal to half cavity length */ |
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37 | r_in[c6+0]+= NormL*r_in[c6+1]; |
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38 | r_in[c6+2]+= NormL*r_in[c6+3]; |
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39 | r_in[c6+5]+= NormL*p_norm*(r_in[c6+1]*r_in[c6+1]+r_in[c6+3]*r_in[c6+3])/2; |
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40 | |
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41 | /* Longitudinal momentum kick */ |
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42 | r_in[c6+4] += -nv*sin(TWOPI*freq*(r_in[c6+5]-lag)/C0); |
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43 | p_norm = 1/(1+r_in[c6+4]); |
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44 | NormL = halflength*p_norm; |
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45 | /* Prropagate through a drift equal to half cavity length */ |
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46 | r_in[c6+0]+= NormL*r_in[c6+1]; |
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47 | r_in[c6+2]+= NormL*r_in[c6+3]; |
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48 | r_in[c6+5]+= NormL*p_norm*(r_in[c6+1]*r_in[c6+1]+r_in[c6+3]*r_in[c6+3])/2; |
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49 | } |
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50 | } |
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51 | } |
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52 | |
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53 | } |
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54 | |
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55 | |
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56 | |
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57 | |
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58 | ExportMode int* passFunction(const mxArray *ElemData,int *FieldNumbers, |
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59 | double *r_in, int num_particles, int mode) |
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60 | |
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61 | |
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62 | #define NUM_FIELDS_2_REMEMBER 5 |
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63 | |
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64 | { double le, volt, freq, energy, lag; |
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65 | int *returnptr; |
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66 | int *NewFieldNumbers, fnum; |
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67 | |
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68 | |
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69 | switch(mode) |
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70 | { case NO_LOCAL_COPY: /* Obsolete in AT1.3 */ |
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71 | { |
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72 | |
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73 | } break; |
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74 | |
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75 | case MAKE_LOCAL_COPY: /* Find field numbers first |
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76 | Save a list of field number in an array |
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77 | and make returnptr point to that array |
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78 | */ |
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79 | { |
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80 | NewFieldNumbers = (int*)mxCalloc(NUM_FIELDS_2_REMEMBER,sizeof(int)); |
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81 | |
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82 | fnum = mxGetFieldNumber(ElemData,"Length"); |
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83 | if(fnum<0) |
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84 | mexErrMsgTxt("Required field 'Length' was not found in the element data structure"); |
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85 | NewFieldNumbers[0] = fnum; |
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86 | |
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87 | fnum = mxGetFieldNumber(ElemData,"Voltage"); |
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88 | if(fnum<0) |
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89 | mexErrMsgTxt("Required field 'Voltage' was not found in the element data structure"); |
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90 | NewFieldNumbers[1] = fnum; |
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91 | |
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92 | fnum = mxGetFieldNumber(ElemData,"Energy"); |
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93 | if(fnum<0) |
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94 | mexErrMsgTxt("Required field 'Energy' was not found in the element data structure"); |
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95 | NewFieldNumbers[2] = fnum; |
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96 | |
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97 | |
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98 | fnum = mxGetFieldNumber(ElemData,"Frequency"); |
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99 | if(fnum<0) |
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100 | mexErrMsgTxt("Required field 'Frequency' was not found in the element data structure"); |
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101 | NewFieldNumbers[3] = fnum; |
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102 | |
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103 | /* Optional field TimeLag */ |
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104 | fnum = mxGetFieldNumber(ElemData,"TimeLag"); |
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105 | NewFieldNumbers[4] = fnum; |
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106 | if(fnum<0) |
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107 | lag = 0; |
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108 | else |
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109 | lag = mxGetScalar(mxGetFieldByNumber(ElemData,0,fnum)); |
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110 | |
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111 | |
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112 | le = mxGetScalar(mxGetFieldByNumber(ElemData,0,NewFieldNumbers[0])); |
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113 | volt = mxGetScalar(mxGetFieldByNumber(ElemData,0,NewFieldNumbers[1])); |
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114 | energy = mxGetScalar(mxGetFieldByNumber(ElemData,0,NewFieldNumbers[2])); |
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115 | freq = mxGetScalar(mxGetFieldByNumber(ElemData,0,NewFieldNumbers[3])); |
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116 | |
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117 | returnptr = NewFieldNumbers; |
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118 | } break; |
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119 | |
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120 | case USE_LOCAL_COPY: /* Get fields from MATLAB using field numbers |
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121 | The second argument ponter to the array of field |
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122 | numbers is previously created with |
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123 | QuadLinPass( ..., MAKE_LOCAL_COPY) |
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124 | */ |
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125 | |
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126 | { le = mxGetScalar(mxGetFieldByNumber(ElemData,0,FieldNumbers[0])); |
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127 | volt = mxGetScalar(mxGetFieldByNumber(ElemData,0,FieldNumbers[1])); |
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128 | energy = mxGetScalar(mxGetFieldByNumber(ElemData,0,FieldNumbers[2])); |
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129 | freq = mxGetScalar(mxGetFieldByNumber(ElemData,0,FieldNumbers[3])); |
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130 | /* Optional field TimeLag */ |
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131 | if(FieldNumbers[4]<0) |
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132 | lag = 0; |
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133 | else |
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134 | lag = mxGetScalar(mxGetFieldByNumber(ElemData,0,FieldNumbers[4])); |
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135 | |
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136 | returnptr = FieldNumbers; |
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137 | } break; |
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138 | |
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139 | default: |
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140 | { mexErrMsgTxt("No match found for calling mode in function CavityPass\n"); |
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141 | } |
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142 | } |
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143 | |
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144 | |
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145 | |
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146 | CavityPass(r_in, le, volt/energy, freq, lag, num_particles); |
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147 | return(returnptr); |
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148 | } |
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149 | |
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150 | |
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151 | |
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152 | |
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153 | |
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154 | |
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155 | |
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156 | |
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157 | |
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158 | void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) |
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159 | { double volt,freq, energy, lag; |
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160 | int m,n; |
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161 | double *r_in, le; |
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162 | mxArray *tmpmxptr; |
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163 | |
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164 | if(nrhs) |
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165 | { |
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166 | |
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167 | /* ALLOCATE memory for the output array of the same size as the input */ |
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168 | m = mxGetM(prhs[1]); |
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169 | n = mxGetN(prhs[1]); |
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170 | if(m!=6) |
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171 | mexErrMsgTxt("Second argument must be a 6 x N matrix"); |
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172 | |
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173 | |
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174 | tmpmxptr=mxGetField(prhs[0],0,"Length"); |
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175 | if(tmpmxptr) |
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176 | le = mxGetScalar(tmpmxptr); |
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177 | else |
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178 | mexErrMsgTxt("Required field 'Length' was not found in the element data structure"); |
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179 | |
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180 | |
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181 | tmpmxptr=mxGetField(prhs[0],0,"Voltage"); |
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182 | if(tmpmxptr) |
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183 | volt = mxGetScalar(tmpmxptr); |
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184 | else |
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185 | mexErrMsgTxt("Required field 'Voltage' was not found in the element data structure"); |
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186 | |
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187 | tmpmxptr=mxGetField(prhs[0],0,"Energy"); |
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188 | if(tmpmxptr) |
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189 | energy = mxGetScalar(tmpmxptr); |
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190 | else |
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191 | mexErrMsgTxt("Required field 'Energy' was not found in the element data structure"); |
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192 | |
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193 | tmpmxptr=mxGetField(prhs[0],0,"Frequency"); |
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194 | if(tmpmxptr) |
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195 | freq = mxGetScalar(tmpmxptr); |
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196 | else |
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197 | mexErrMsgTxt("Required field 'Frequency' was not found in the element data structure"); |
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198 | |
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199 | tmpmxptr=mxGetField(prhs[0],0,"TimeLag"); |
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200 | if(tmpmxptr) |
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201 | lag = mxGetScalar(tmpmxptr); |
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202 | else |
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203 | lag = 0; |
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204 | |
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205 | |
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206 | plhs[0] = mxDuplicateArray(prhs[1]); |
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207 | r_in = mxGetPr(plhs[0]); |
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208 | CavityPass(r_in, le, volt/energy, freq, lag, n); |
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209 | } |
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210 | else |
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211 | { /* return list of required fields */ |
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212 | plhs[0] = mxCreateCellMatrix(4,1); |
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213 | mxSetCell(plhs[0],0,mxCreateString("Length")); |
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214 | mxSetCell(plhs[0],1,mxCreateString("Voltage")); |
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215 | mxSetCell(plhs[0],2,mxCreateString("Energy")); |
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216 | mxSetCell(plhs[0],3,mxCreateString("Frequency")); |
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217 | if(nlhs>1) /* optional fields */ |
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218 | { plhs[1] = mxCreateCellMatrix(1,1); |
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219 | mxSetCell(plhs[1],0,mxCreateString("TimeLag")); |
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220 | } |
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221 | } |
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222 | |
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223 | } |
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