source: sasview/sansmodels/src/sans/models/c_models/sphere.cpp @ 9696b075

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Last change on this file since 9696b075 was 0f5bc9f, checked in by Mathieu Doucet <doucetm@…>, 16 years ago

Update of all C models to the new style of C++ models

  • Property mode set to 100644
File size: 2.3 KB
Line 
1/**
2        This software was developed by the University of Tennessee as part of the
3        Distributed Data Analysis of Neutron Scattering Experiments (DANSE)
4        project funded by the US National Science Foundation.
5
6        If you use DANSE applications to do scientific research that leads to
7        publication, we ask that you acknowledge the use of the software with the
8        following sentence:
9
10        "This work benefited from DANSE software developed under NSF award DMR-0520547."
11
12        copyright 2008, University of Tennessee
13 */
14
15/**
16 * Scattering model classes
17 * The classes use the IGOR library found in
18 *   sansmodels/src/libigor
19 *
20 */
21
22#include <math.h>
23#include "models.hh"
24#include "parameters.hh"
25#include <stdio.h>
26using namespace std;
27
28extern "C" {
29        #include "libSphere.h"
30}
31
32SphereModel :: SphereModel() {
33        scale      = Parameter(1.0);
34        radius     = Parameter(20.0, true);
35        radius.set_min(0.0);
36        contrast   = Parameter(3.e-6);
37        background = Parameter(0.0);
38}
39
40/**
41 * Function to evaluate 1D scattering function
42 * The NIST IGOR library is used for the actual calculation.
43 * @param q: q-value
44 * @return: function value
45 */
46double SphereModel :: operator()(double q) {
47        double dp[4];
48
49        // Fill parameter array for IGOR library
50        // Add the background after averaging
51        dp[0] = scale();
52        dp[1] = radius();
53        dp[2] = contrast();
54        dp[3] = 0.0;
55
56        // Get the dispersion points for the radius
57        vector<WeightPoint> weights_rad;
58        radius.get_weights(weights_rad);
59
60        // Perform the computation, with all weight points
61        double sum = 0.0;
62        double norm = 0.0;
63
64        // Loop over radius weight points
65        for(int i=0; i<weights_rad.size(); i++) {
66                dp[1] = weights_rad[i].value;
67
68                sum += weights_rad[i].weight
69                        * SphereForm(dp, q);
70                norm += weights_rad[i].weight;
71        }
72        return sum/norm + background();
73}
74
75/**
76 * Function to evaluate 2D scattering function
77 * @param q_x: value of Q along x
78 * @param q_y: value of Q along y
79 * @return: function value
80 */
81double SphereModel :: operator()(double qx, double qy) {
82        double q = sqrt(qx*qx + qy*qy);
83        return (*this).operator()(q);
84}
85
86/**
87 * Function to evaluate 2D scattering function
88 * @param pars: parameters of the sphere
89 * @param q: q-value
90 * @param phi: angle phi
91 * @return: function value
92 */
93double SphereModel :: evaluate_rphi(double q, double phi) {
94        return (*this).operator()(q);
95}
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