[339ce67] | 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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