Changes in sasmodels/models/hollow_rectangular_prism.c [1e7b0db0:8de1477] in sasmodels
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sasmodels/models/hollow_rectangular_prism.c
r1e7b0db0 r8de1477 1 1 double form_volume(double length_a, double b2a_ratio, double c2a_ratio, double thickness); 2 double Iq(double q, double sld, double solvent_sld, double length_a, 2 double Iq(double q, double sld, double solvent_sld, double length_a, 3 3 double b2a_ratio, double c2a_ratio, double thickness); 4 4 … … 37 37 const double v2a = 0.0; 38 38 const double v2b = M_PI_2; //phi integration limits 39 39 40 40 double outer_sum = 0.0; 41 41 for(int i=0; i<76; i++) { … … 84 84 return 1.0e-4 * delrho * delrho * form; 85 85 } 86 87 double Iqxy(double qa, double qb, double qc, 88 double sld, 89 double solvent_sld, 90 double length_a, 91 double b2a_ratio, 92 double c2a_ratio, 93 double thickness) 94 { 95 const double length_b = length_a * b2a_ratio; 96 const double length_c = length_a * c2a_ratio; 97 const double a_half = 0.5 * length_a; 98 const double b_half = 0.5 * length_b; 99 const double c_half = 0.5 * length_c; 100 const double vol_total = length_a * length_b * length_c; 101 const double vol_core = 8.0 * (a_half-thickness) * (b_half-thickness) * (c_half-thickness); 102 103 // Amplitude AP from eqn. (13) 104 105 const double termA1 = sas_sinx_x(qa * a_half); 106 const double termA2 = sas_sinx_x(qa * (a_half-thickness)); 107 108 const double termB1 = sas_sinx_x(qb * b_half); 109 const double termB2 = sas_sinx_x(qb * (b_half-thickness)); 110 111 const double termC1 = sas_sinx_x(qc * c_half); 112 const double termC2 = sas_sinx_x(qc * (c_half-thickness)); 113 114 const double AP1 = vol_total * termA1 * termB1 * termC1; 115 const double AP2 = vol_core * termA2 * termB2 * termC2; 116 117 // Multiply by contrast^2. Factor corresponding to volume^2 cancels with previous normalization. 118 const double delrho = sld - solvent_sld; 119 120 // Convert from [1e-12 A-1] to [cm-1] 121 return 1.0e-4 * square(delrho * (AP1-AP2)); 122 }
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