[20d91bd] | 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 | #include <math.h> |
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| 16 | #include "parameters.hh" |
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| 17 | #include <stdio.h> |
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| 18 | using namespace std; |
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| 19 | #include "schulz.h" |
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| 20 | |
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[cd127d2] | 21 | #if defined(_MSC_VER) |
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| 22 | #include "gamma_win.h" |
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| 23 | #endif |
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| 24 | |
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[20d91bd] | 25 | Schulz :: Schulz() { |
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| 26 | scale = Parameter(1.0, true); |
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| 27 | sigma = Parameter(1.0, true); |
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| 28 | center = Parameter(0.0, true); |
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| 29 | } |
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| 30 | |
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| 31 | /** |
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| 32 | * Function to evaluate 1D scattering function |
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| 33 | /** |
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| 34 | * Function to evaluate 1D Schulz function. |
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| 35 | * The function is normalized to the 'scale' parameter. |
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| 36 | * |
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| 37 | * f(x)=scale * math.pow(z+1, z+1)*math.pow((R), z)* |
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| 38 | * math.exp(-R*(z+1))/(center*gamma(z+1) |
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| 39 | * z= math.pow[(1/(sigma/center),2]-1 |
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| 40 | * R= x/center |
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| 41 | * |
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| 42 | * @param q: q-value |
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| 43 | * @return: function value |
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| 44 | */ |
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| 45 | double Schulz :: operator()(double q) { |
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| 46 | double z = pow(center()/ sigma(), 2)-1; |
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| 47 | double R= q/center(); |
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| 48 | double zz= z+1; |
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| 49 | double expo; |
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| 50 | expo = log(scale())+zz*log(zz)+z*log(R)-R*zz-log(center())-lgamma(zz); |
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| 51 | |
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| 52 | return exp(expo);//scale * pow(zz,zz) * pow(R,z) * exp(-1*R*zz)/((center) * tgamma(zz)) ; |
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| 53 | } |
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| 54 | |
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| 55 | /** |
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| 56 | * Function to evaluate 2D schulz function |
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| 57 | * The function is normalized to the 'scale' parameter. |
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| 58 | * |
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| 59 | * f(x,y) = Schulz(x) * Schulz(y) |
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| 60 | * |
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| 61 | * where both Shulzs share the same parameters. |
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| 62 | * @param q_x: value of Q along x |
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| 63 | * @param q_y: value of Q along y |
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| 64 | * @return: function value |
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| 65 | */ |
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| 66 | double Schulz :: operator()(double qx, double qy) { |
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| 67 | return (*this).operator()(qx) * (*this).operator()(qy); |
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| 68 | } |
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| 69 | |
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| 70 | /** |
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| 71 | * Function to evaluate 2D schulz function |
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| 72 | * The function is normalized to the 'scale' parameter. |
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| 73 | * |
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| 74 | * f(x,y) = Schulz(x) * Schulz(y) |
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| 75 | * |
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| 76 | * where both Shulzs share the same parameters. |
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| 77 | * @param pars: parameters of the cylinder |
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| 78 | * @param q: q-value |
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| 79 | * @param phi: angle phi |
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| 80 | * @return: function value |
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| 81 | */ |
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| 82 | double Schulz :: evaluate_rphi(double q, double phi) { |
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| 83 | double qx = q*cos(phi); |
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| 84 | double qy = q*sin(phi); |
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| 85 | return (*this).operator()(qx, qy); |
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| 86 | } |
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| 87 | /** |
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| 88 | * Function to calculate effective radius |
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| 89 | * @return: effective radius value |
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| 90 | */ |
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| 91 | double Schulz :: calculate_ER() { |
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| 92 | //NOT implemented yet!!! |
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| 93 | return 0.0; |
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| 94 | } |
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[e08bd5b] | 95 | double Schulz :: calculate_VR() { |
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| 96 | return 1.0; |
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| 97 | } |
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