source: sasview/sansmodels/src/sans/models/CoreShellCylinderModel.py @ a706353b

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Last change on this file since a706353b was 79ac6f8, checked in by Gervaise Alina <gervyh@…>, 15 years ago

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1#!/usr/bin/env python
2
3##############################################################################
4#       This software was developed by the University of Tennessee as part of the
5#       Distributed Data Analysis of Neutron Scattering Experiments (DANSE)
6#       project funded by the US National Science Foundation.
7#
8#       If you use DANSE applications to do scientific research that leads to
9#       publication, we ask that you acknowledge the use of the software with the
10#       following sentence:
11#
12#       "This work benefited from DANSE software developed under NSF award DMR-0520547."
13#
14#       copyright 2008, University of Tennessee
15##############################################################################
16
17
18"""
19Provide functionality for a C extension model
20
21:WARNING: THIS FILE WAS GENERATED BY WRAPPERGENERATOR.PY
22         DO NOT MODIFY THIS FILE, MODIFY ..\c_extensions\core_shell_cylinder.h
23         AND RE-RUN THE GENERATOR SCRIPT
24
25"""
26
27from sans.models.BaseComponent import BaseComponent
28from sans_extension.c_models import CCoreShellCylinderModel
29import copy   
30   
31class CoreShellCylinderModel(CCoreShellCylinderModel, BaseComponent):
32    """
33    Class that evaluates a CoreShellCylinderModel model.
34    This file was auto-generated from ..\c_extensions\core_shell_cylinder.h.
35    Refer to that file and the structure it contains
36    for details of the model.
37    List of default parameters:
38         scale           = 1.0
39         radius          = 20.0 [A]
40         thickness       = 10.0 [A]
41         length          = 400.0 [A]
42         core_sld        = 1e-006 [1/A^(2)]
43         shell_sld       = 4e-006 [1/A^(2)]
44         solvent_sld     = 1e-006 [1/A^(2)]
45         background      = 0.0 [1/cm]
46         axis_theta      = 1.57 [rad]
47         axis_phi        = 0.0 [rad]
48
49    """
50       
51    def __init__(self):
52        """ Initialization """
53       
54        # Initialize BaseComponent first, then sphere
55        BaseComponent.__init__(self)
56        CCoreShellCylinderModel.__init__(self)
57       
58        ## Name of the model
59        self.name = "CoreShellCylinderModel"
60        ## Model description
61        self.description ="""P(q,alpha)= scale/Vs*f(q)^(2) + bkg,  where: f(q)= 2(core_sld
62                - solvant_sld)* Vc*sin[qLcos(alpha/2)]
63                /[qLcos(alpha/2)]*J1(qRsin(alpha))
64                /[qRsin(alpha)]+2(shell_sld-solvent_sld)
65                *Vs*sin[q(L+T)cos(alpha/2)][[q(L+T)
66                *cos(alpha/2)]*J1(q(R+T)sin(alpha))
67                /q(R+T)sin(alpha)]
68               
69                alpha:is the angle between the axis of
70                the cylinder and the q-vector
71                Vs: the volume of the outer shell
72                Vc: the volume of the core
73                L: the length of the core
74                shell_sld: the scattering length density
75                of the shell
76                solvent_sld: the scattering length density
77                of the solvent
78                bkg: the background
79                T: the thickness
80                R+T: is the outer radius
81                L+2T: The total length of the outershell
82                J1: the first order Bessel function
83                theta: axis_theta of the cylinder
84                phi: the axis_phi of the cylinder..."""
85       
86        ## Parameter details [units, min, max]
87        self.details = {}
88        self.details['scale'] = ['', None, None]
89        self.details['radius'] = ['[A]', None, None]
90        self.details['thickness'] = ['[A]', None, None]
91        self.details['length'] = ['[A]', None, None]
92        self.details['core_sld'] = ['[1/A^(2)]', None, None]
93        self.details['shell_sld'] = ['[1/A^(2)]', None, None]
94        self.details['solvent_sld'] = ['[1/A^(2)]', None, None]
95        self.details['background'] = ['[1/cm]', None, None]
96        self.details['axis_theta'] = ['[rad]', None, None]
97        self.details['axis_phi'] = ['[rad]', None, None]
98
99        ## fittable parameters
100        self.fixed=['axis_phi.width', 'axis_theta.width', 'length.width', 'radius.width', 'thickness.width']
101       
102        ## parameters with orientation
103        self.orientation_params =['axis_phi', 'axis_theta', 'axis_phi.width', 'axis_theta.width']
104   
105    def clone(self):
106        """ Return a identical copy of self """
107        return self._clone(CoreShellCylinderModel())   
108       
109    def __getstate__(self):
110        """
111        return object state for pickling and copying
112        """
113        model_state = {'params': self.params, 'dispersion': self.dispersion, 'log': self.log}
114       
115        return self.__dict__, model_state
116       
117    def __setstate__(self, state):
118        """
119        create object from pickled state
120       
121        :param state: the state of the current model
122       
123        """
124       
125        self.__dict__, model_state = state
126        self.params = model_state['params']
127        self.dispersion = model_state['dispersion']
128        self.log = model_state['log']
129       
130   
131    def run(self, x=0.0):
132        """
133        Evaluate the model
134       
135        :param x: input q, or [q,phi]
136       
137        :return: scattering function P(q)
138       
139        """
140       
141        return CCoreShellCylinderModel.run(self, x)
142   
143    def runXY(self, x=0.0):
144        """
145        Evaluate the model in cartesian coordinates
146       
147        :param x: input q, or [qx, qy]
148       
149        :return: scattering function P(q)
150       
151        """
152       
153        return CCoreShellCylinderModel.runXY(self, x)
154       
155    def evalDistribution(self, x=[]):
156        """
157        Evaluate the model in cartesian coordinates
158       
159        :param x: input q[], or [qx[], qy[]]
160       
161        :return: scattering function P(q[])
162       
163        """
164        return CCoreShellCylinderModel.evalDistribution(self, x)
165       
166    def calculate_ER(self):
167        """
168        Calculate the effective radius for P(q)*S(q)
169       
170        :return: the value of the effective radius
171       
172        """       
173        return CCoreShellCylinderModel.calculate_ER(self)
174       
175    def set_dispersion(self, parameter, dispersion):
176        """
177        Set the dispersion object for a model parameter
178       
179        :param parameter: name of the parameter [string]
180        :param dispersion: dispersion object of type DispersionModel
181       
182        """
183        return CCoreShellCylinderModel.set_dispersion(self, parameter, dispersion.cdisp)
184       
185   
186# End of file
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