1 | /** |
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2 | This software was developed by the University of Tennessee as part of the |
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3 | Distributed Data Analysis of Neutron Scattering Experiments (DANSE) |
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4 | project funded by the US National Science Foundation. |
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5 | |
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6 | If you use DANSE applications to do scientific research that leads to |
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7 | publication, we ask that you acknowledge the use of the software with the |
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8 | following sentence: |
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9 | |
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10 | "This work benefited from DANSE software developed under NSF award DMR-0520547." |
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11 | |
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12 | copyright 2008, University of Tennessee |
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13 | */ |
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14 | |
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15 | /** |
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16 | * Scattering model classes |
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17 | * The classes use the IGOR library found in |
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18 | * sansmodels/src/libigor |
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19 | * |
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20 | */ |
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21 | |
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22 | #include <math.h> |
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23 | #include "models.hh" |
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24 | #include "parameters.hh" |
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25 | #include <stdio.h> |
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26 | using namespace std; |
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27 | |
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28 | extern "C" { |
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29 | #include "libCylinder.h" |
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30 | #include "barbell.h" |
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31 | } |
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32 | |
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33 | BarBellModel :: BarBellModel() { |
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34 | scale = Parameter(1.0); |
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35 | rad_bar = Parameter(20.0); |
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36 | rad_bar.set_min(0.0); |
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37 | len_bar = Parameter(400.0, true); |
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38 | len_bar.set_min(0.0); |
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39 | rad_bell = Parameter(40.0); |
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40 | rad_bell.set_min(0.0); |
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41 | sld_barbell = Parameter(1.0e-6); |
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42 | sld_solv = Parameter(6.3e-6); |
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43 | background = Parameter(0.0); |
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44 | theta = Parameter(0.0, true); |
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45 | phi = Parameter(0.0, true); |
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46 | } |
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47 | |
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48 | /** |
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49 | * Function to evaluate 1D scattering function |
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50 | * The NIST IGOR library is used for the actual calculation. |
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51 | * @param q: q-value |
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52 | * @return: function value |
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53 | */ |
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54 | double BarBellModel :: operator()(double q) { |
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55 | double dp[7]; |
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56 | |
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57 | // Fill parameter array for IGOR library |
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58 | // Add the background after averaging |
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59 | dp[0] = scale(); |
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60 | dp[1] = rad_bar(); |
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61 | dp[2] = len_bar(); |
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62 | dp[3] = rad_bell(); |
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63 | dp[4] = sld_barbell(); |
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64 | dp[5] = sld_solv(); |
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65 | dp[6] = 0.0; |
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66 | |
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67 | // Get the dispersion points for the rad_bar |
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68 | vector<WeightPoint> weights_rad_bar; |
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69 | rad_bar.get_weights(weights_rad_bar); |
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70 | // Get the dispersion points for the len_bar |
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71 | vector<WeightPoint> weights_len_bar; |
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72 | len_bar.get_weights(weights_len_bar); |
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73 | // Get the dispersion points for the rad_bell |
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74 | vector<WeightPoint> weights_rad_bell; |
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75 | rad_bell.get_weights(weights_rad_bell); |
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76 | |
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77 | // Perform the computation, with all weight points |
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78 | double sum = 0.0; |
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79 | double norm = 0.0; |
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80 | double vol = 0.0; |
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81 | double pi,hDist,result; |
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82 | double vol_i = 0.0; |
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83 | pi = 4.0*atan(1.0); |
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84 | // Loop over radius weight points |
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85 | for(int i=0; i<weights_rad_bar.size(); i++) { |
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86 | dp[1] = weights_rad_bar[i].value; |
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87 | for(int j=0; j<weights_len_bar.size(); j++) { |
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88 | dp[2] = weights_len_bar[j].value; |
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89 | for(int k=0; k<weights_rad_bell.size(); k++) { |
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90 | dp[3] = weights_rad_bell[k].value; |
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91 | |
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92 | //Un-normalize SphereForm by volume |
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93 | hDist = sqrt(fabs(dp[3]*dp[3]-dp[1]*dp[1])); |
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94 | vol_i = pi*dp[1]*dp[1]*dp[2]+2.0*pi*(2.0*dp[3]*dp[3]*dp[3]/3.0 |
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95 | +dp[3]*dp[3]*hDist-hDist*hDist*hDist/3.0); |
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96 | result = Barbell(dp, q) * vol_i; |
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97 | // This FIXES a singualrity the kernel in libigor. |
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98 | if ( result == INFINITY || result == NAN){ |
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99 | result = 0.0; |
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100 | } |
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101 | sum += weights_rad_bar[i].weight*weights_len_bar[j].weight*weights_rad_bell[k].weight |
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102 | * result; |
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103 | //Find average volume |
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104 | vol += weights_rad_bar[i].weight*weights_len_bar[j].weight*weights_rad_bell[k].weight |
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105 | * vol_i; |
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106 | |
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107 | norm += weights_rad_bar[i].weight*weights_len_bar[j].weight*weights_rad_bell[k].weight; |
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108 | } |
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109 | } |
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110 | } |
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111 | |
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112 | if (vol != 0.0 && norm != 0.0) { |
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113 | //Re-normalize by avg volume |
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114 | sum = sum/(vol/norm);} |
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115 | return sum/norm + background(); |
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116 | } |
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117 | |
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118 | /** |
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119 | * Function to evaluate 2D scattering function |
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120 | * @param q_x: value of Q along x |
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121 | * @param q_y: value of Q along y |
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122 | * @return: function value |
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123 | */ |
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124 | double BarBellModel :: operator()(double qx, double qy) { |
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125 | BarBellParameters dp; |
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126 | |
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127 | double q = sqrt(qx*qx + qy*qy); |
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128 | dp.scale = scale(); |
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129 | dp.rad_bar = rad_bar(); |
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130 | dp.len_bar = len_bar(); |
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131 | dp.rad_bell = rad_bell(); |
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132 | dp.sld_barbell = sld_barbell(); |
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133 | dp.sld_solv = sld_solv(); |
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134 | dp.background = 0.0; |
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135 | dp.theta = theta(); |
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136 | dp.phi = phi(); |
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137 | |
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138 | |
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139 | // Get the dispersion points for the rad_bar |
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140 | vector<WeightPoint> weights_rad_bar; |
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141 | rad_bar.get_weights(weights_rad_bar); |
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142 | |
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143 | // Get the dispersion points for the len_bar |
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144 | vector<WeightPoint> weights_len_bar; |
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145 | len_bar.get_weights(weights_len_bar); |
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146 | |
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147 | // Get the dispersion points for the rad_bell |
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148 | vector<WeightPoint> weights_rad_bell; |
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149 | rad_bell.get_weights(weights_rad_bell); |
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150 | |
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151 | // Get angular averaging for theta |
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152 | vector<WeightPoint> weights_theta; |
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153 | theta.get_weights(weights_theta); |
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154 | |
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155 | // Get angular averaging for phi |
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156 | vector<WeightPoint> weights_phi; |
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157 | phi.get_weights(weights_phi); |
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158 | |
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159 | |
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160 | // Perform the computation, with all weight points |
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161 | double sum = 0.0; |
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162 | double norm = 0.0; |
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163 | double norm_vol = 0.0; |
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164 | double vol = 0.0; |
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165 | double pi,hDist,result; |
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166 | double vol_i = 0.0; |
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167 | pi = 4.0*atan(1.0); |
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168 | |
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169 | // Loop over radius weight points |
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170 | for(int i=0; i<weights_rad_bar.size(); i++) { |
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171 | dp.rad_bar = weights_rad_bar[i].value; |
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172 | for(int j=0; j<weights_len_bar.size(); j++) { |
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173 | dp.len_bar = weights_len_bar[j].value; |
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174 | for(int k=0; k<weights_rad_bell.size(); k++) { |
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175 | dp.rad_bell = weights_rad_bell[k].value; |
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176 | // Average over theta distribution |
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177 | for(int l=0; l< weights_theta.size(); l++) { |
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178 | dp.theta = weights_theta[l].value; |
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179 | // Average over phi distribution |
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180 | for(int m=0; m< weights_phi.size(); m++) { |
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181 | dp.phi = weights_phi[m].value; |
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182 | //Un-normalize Form by volume |
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183 | hDist = sqrt(fabs(dp.rad_bell*dp.rad_bell-dp.rad_bar*dp.rad_bar)); |
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184 | vol_i = pi*dp.rad_bar*dp.rad_bar*dp.len_bar+2.0*pi*(2.0*dp.rad_bell*dp.rad_bell*dp.rad_bell/3.0 |
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185 | +dp.rad_bell*dp.rad_bell*hDist-hDist*hDist*hDist/3.0); |
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186 | |
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187 | double _ptvalue = weights_rad_bar[i].weight |
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188 | * weights_len_bar[j].weight |
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189 | * weights_rad_bell[k].weight |
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190 | * weights_theta[l].weight |
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191 | * weights_phi[m].weight |
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192 | * vol_i |
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193 | * barbell_analytical_2DXY(&dp, qx, qy); |
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194 | //* pow(weights_rad[i].value,3.0); |
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195 | // Consider when there is infinte or nan. |
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196 | if ( _ptvalue == INFINITY || _ptvalue == NAN){ |
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197 | _ptvalue = 0.0; |
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198 | } |
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199 | if (weights_theta.size()>1) { |
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200 | _ptvalue *= sin(weights_theta[l].value); |
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201 | } |
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202 | sum += _ptvalue; |
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203 | // This model dose not need the volume of spheres correction!!! |
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204 | //Find average volume |
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205 | vol += weights_rad_bar[i].weight |
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206 | * weights_len_bar[j].weight |
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207 | * weights_rad_bell[k].weight |
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208 | * vol_i; |
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209 | //Find norm for volume |
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210 | norm_vol += weights_rad_bar[i].weight |
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211 | * weights_len_bar[j].weight |
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212 | * weights_rad_bell[k].weight; |
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213 | |
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214 | norm += weights_rad_bar[i].weight |
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215 | * weights_len_bar[j].weight |
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216 | * weights_rad_bell[k].weight |
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217 | * weights_theta[l].weight |
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218 | * weights_phi[m].weight; |
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219 | } |
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220 | } |
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221 | } |
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222 | } |
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223 | } |
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224 | // Averaging in theta needs an extra normalization |
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225 | // factor to account for the sin(theta) term in the |
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226 | // integration (see documentation). |
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227 | if (weights_theta.size()>1) norm = norm / asin(1.0); |
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228 | |
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229 | if (vol != 0.0 && norm_vol != 0.0) { |
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230 | //Re-normalize by avg volume |
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231 | sum = sum/(vol/norm_vol);} |
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232 | |
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233 | return sum/norm + background(); |
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234 | } |
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235 | |
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236 | /** |
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237 | * Function to evaluate 2D scattering function |
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238 | * @param pars: parameters of the SCCrystal |
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239 | * @param q: q-value |
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240 | * @param phi: angle phi |
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241 | * @return: function value |
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242 | */ |
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243 | double BarBellModel :: evaluate_rphi(double q, double phi) { |
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244 | return (*this).operator()(q); |
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245 | } |
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246 | |
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247 | /** |
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248 | * Function to calculate effective radius |
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249 | * @return: effective radius value |
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250 | */ |
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251 | double BarBellModel :: calculate_ER() { |
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252 | //NOT implemented yet!!! |
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253 | } |
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