source: sasview/sansmodels/src/sans/models/FractalAbsModel.py @ 09e89b7

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Last change on this file since 09e89b7 was 79ac6f8, checked in by Gervaise Alina <gervyh@…>, 14 years ago

working on documentation

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1#!/usr/bin/env python
2"""
3Provide F(x)= P(|x|)*S(|x|) + bkd
4Fractal as a BaseComponent model
5"""
6
7from sans.models.FractalModel import FractalModel
8import math
9
10class FractalAbsModel(FractalModel):
11    """
12    Class that evaluates a Fractal function.
13   
14    F(|x|)= P(|x|)*S(|x|) + bkd
15    The model has Seven parameters:
16        scale        =  Volume fraction
17        radius       =  Block radius
18        fractal_dim  =  Fractal dimension
19        corr_length  =  correlation Length
20        block_sld    =  SDL block
21        solvent_sld  =  SDL solvent
22        background   =  background
23       
24    """
25    def __init__(self):
26        """Initialization """
27        # Initialize FractalModel
28
29        FractalModel.__init__(self)
30        ## Name of the model
31        self.name = "Absolute Number Density Fractal"
32        self.description="""
33        I(x)= P(|x|)*S(|x|) + bkd
34       
35        p(x)= scale* V^(2)*delta^(2)* F(x*radius)^(2)
36        F(x) = 3*[sin(x)-x cos(x)]/x**3
37       
38        The model has Seven parameters:
39        scale        =  Volume fraction
40        radius       =  Block radius
41        fractal_dim  =  Fractal dimension
42        corr_length  =  correlation Length
43        block_sld    =  SDL block
44        solvent_sld  =  SDL solvent
45        background   =  background
46        """
47    def _Fractal(self, x):
48        """
49        """
50        return FractalModel._Fractal(self, math.fabs(x))
51   
52   
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