source: sasview/sansmodels/src/sans/models/c_extensions/lorentzian.h @ c572e5e

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Last change on this file since c572e5e was 59b9b675, checked in by Jae Cho <jhjcho@…>, 14 years ago

1) reverting diperser(used only in test) files for unittest. 2)changed the sigma of polydispersion to ratio for length parameters. 3) update an unittest

  • Property mode set to 100644
File size: 949 bytes
Line 
1#if !defined(lorentzian_h)
2#define lorentzian_h
3
4/** Structure definition for Lorentzian parameters.
5 * The Lorentzian is normalized to the 'scale' parameter.
6 * 
7 * f(x)=scale * 1/pi 0.5gamma / [ (x-x_0)^2 + (0.5gamma)^2 ]
8 *
9 * [PYTHONCLASS] = Lorentzian
10 * [DESCRIPTION] = <text>f(x)=scale * 1/pi 0.5gamma / [ (x-x_0)^2 + (0.5gamma)^2 ]</text>
11 */
12typedef struct {
13    /// Scale factor
14    //  [DEFAULT]=scale=1.0
15    double scale;
16    /// Width
17    //  [DEFAULT]=gamma=1.0
18    double gamma;
19    /// Center of the Lorentzian distribution
20    //  [DEFAULT]=center=0.0
21    double center;
22} LorentzianParameters;
23
24/// 1D lorentzian function
25double lorentzian_analytical_1D(LorentzianParameters *pars, double x);
26
27/// 2D lorentzian function
28double lorentzian_analytical_2D(LorentzianParameters *pars, double x, double phi);
29double lorentzian_analytical_2DXY(LorentzianParameters *pars, double x, double y);
30
31#endif
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