source: sasview/sansmodels/src/sans/models/c_extensions/polygausscoil.h @ a0da535

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Last change on this file since a0da535 was 8426622, checked in by Jae Cho <jhjcho@…>, 15 years ago

rearranged the model description for better view

  • Property mode set to 100644
File size: 1.3 KB
Line 
1#if !defined(polygausscoil_h)
2#define polygausscoil_h
3
4/**
5 * Structure definition for sphere parameters
6 */
7 //[PYTHONCLASS] = Poly_GaussCoil
8 //[DISP_PARAMS] = rg
9 //[DESCRIPTION] =<text>I(q)=(scale)*2*[(1+U*x)^(-1/U)+x-1]/[(1+U)*x^2] + background
10 //                             where x = [rg^2*q^2]
11 //                                     and the polydispersity is
12 //                                     U = [M_w/M_n]-1.
13 //                             scale = scale factor * volume fraction
14 //                             rg = radius of gyration
15 //                             poly_m = polydispersity of molecular weight
16 //                             background = incoherent background
17 //             </text>
18 //[FIXED]=
19 //[ORIENTATION_PARAMS]= <text> </text>
20
21typedef struct {
22    /// Scale factor
23    //  [DEFAULT]=scale= 1.0
24    double scale;
25
26    /// Radius of gyration [A]
27    //  [DEFAULT]=rg=60.0 [A]
28    double rg;
29
30    /// polydispersity of molecular weight
31    //  [DEFAULT]=poly_m= 2.0 [Mw/Mn]
32    double poly_m;
33
34        /// Incoherent Background [1/cm]
35        //  [DEFAULT]=background=0.001 [1/cm]
36        double background;
37} PolyGaussCoilParameters;
38
39
40
41/// 1D scattering function
42double polygausscoil_analytical_1D(PolyGaussCoilParameters *pars, double q);
43
44/// 2D scattering function
45double polygausscoil_analytical_2D(PolyGaussCoilParameters *pars, double q, double phi);
46double polygausscoil_analytical_2DXY(PolyGaussCoilParameters *pars, double qx, double qy);
47
48#endif
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