source: sasview/sansmodels/src/sans/models/CoreShellCylinderModel.py @ d37ba31

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Last change on this file since d37ba31 was 1ed3834, checked in by Jae Cho <jhjcho@…>, 16 years ago

unit symbol Angst. back to A and re-organized model descriptions

  • Property mode set to 100644
File size: 4.7 KB
Line 
1#!/usr/bin/env python
2"""
3        This software was developed by the University of Tennessee as part of the
4        Distributed Data Analysis of Neutron Scattering Experiments (DANSE)
5        project funded by the US National Science Foundation.
6
7        If you use DANSE applications to do scientific research that leads to
8        publication, we ask that you acknowledge the use of the software with the
9        following sentence:
10
11        "This work benefited from DANSE software developed under NSF award DMR-0520547."
12
13        copyright 2008, University of Tennessee
14"""
15
16""" Provide functionality for a C extension model
17
18        WARNING: THIS FILE WAS GENERATED BY WRAPPERGENERATOR.PY
19                 DO NOT MODIFY THIS FILE, MODIFY ..\c_extensions\core_shell_cylinder.h
20                 AND RE-RUN THE GENERATOR SCRIPT
21
22"""
23
24from sans.models.BaseComponent import BaseComponent
25from sans_extension.c_models import CCoreShellCylinderModel
26import copy   
27   
28class CoreShellCylinderModel(CCoreShellCylinderModel, BaseComponent):
29    """ Class that evaluates a CoreShellCylinderModel model.
30        This file was auto-generated from ..\c_extensions\core_shell_cylinder.h.
31        Refer to that file and the structure it contains
32        for details of the model.
33        List of default parameters:
34         scale           = 1.0
35         radius          = 20.0 [A]
36         thickness       = 10.0 [A]
37         length          = 400.0 [A]
38         core_sld        = 1e-006 [1/A²]
39         shell_sld       = 4e-006 [1/A²]
40         solvent_sld     = 1e-006 [1/A²]
41         background      = 0.0 [1/cm]
42         axis_theta      = 1.57 [rad]
43         axis_phi        = 0.0 [rad]
44
45    """
46       
47    def __init__(self):
48        """ Initialization """
49       
50        # Initialize BaseComponent first, then sphere
51        BaseComponent.__init__(self)
52        CCoreShellCylinderModel.__init__(self)
53       
54        ## Name of the model
55        self.name = "CoreShellCylinderModel"
56        ## Model description
57        self.description ="""P(q,alpha)= scale/Vs*f(q)^(2) + bkg,  where: f(q)= 2(core_sld
58                - solvant_sld)* Vc*sin[qLcos(alpha/2)]
59                /[qLcos(alpha/2)]*J1(qRsin(alpha))
60                /[qRsin(alpha)]+2(shell_sld-solvent_sld)
61                *Vs*sin[q(L+T)cos(alpha/2)][[q(L+T)
62                *cos(alpha/2)]*J1(q(R+T)sin(alpha))
63                /q(R+T)sin(alpha)]
64               
65                alpha:is the angle between the axis of
66                the cylinder and the q-vector
67                Vs: the volume of the outer shell
68                Vc: the volume of the core
69                L: the length of the core
70                shell_sld: the scattering length density
71                of the shell
72                solvent_sld: the scattering length density
73                of the solvent
74                bkg: the background
75                T: the thickness
76                R+T: is the outer radius
77                L+2T: The total length of the outershell
78                J1: the first order Bessel function
79                theta: axis_theta of the cylinder
80                phi: the axis_phi of the cylinder"""
81       
82                ## Parameter details [units, min, max]
83        self.details = {}
84        self.details['scale'] = ['', None, None]
85        self.details['radius'] = ['[A]', None, None]
86        self.details['thickness'] = ['[A]', None, None]
87        self.details['length'] = ['[A]', None, None]
88        self.details['core_sld'] = ['[1/A²]', None, None]
89        self.details['shell_sld'] = ['[1/A²]', None, None]
90        self.details['solvent_sld'] = ['[1/A²]', None, None]
91        self.details['background'] = ['[1/cm]', None, None]
92        self.details['axis_theta'] = ['[rad]', None, None]
93        self.details['axis_phi'] = ['[rad]', None, None]
94
95                ## fittable parameters
96        self.fixed=['axis_phi.width', 'axis_theta.width', 'length.width', 'radius.width', 'thickness_width']
97       
98        ## parameters with orientation
99        self.orientation_params =['axis_phi', 'axis_theta', 'axis_phi.width', 'axis_theta.width']
100   
101    def clone(self):
102        """ Return a identical copy of self """
103        return self._clone(CoreShellCylinderModel())   
104   
105    def run(self, x = 0.0):
106        """ Evaluate the model
107            @param x: input q, or [q,phi]
108            @return: scattering function P(q)
109        """
110       
111        return CCoreShellCylinderModel.run(self, x)
112   
113    def runXY(self, x = 0.0):
114        """ Evaluate the model in cartesian coordinates
115            @param x: input q, or [qx, qy]
116            @return: scattering function P(q)
117        """
118       
119        return CCoreShellCylinderModel.runXY(self, x)
120       
121    def set_dispersion(self, parameter, dispersion):
122        """
123            Set the dispersion object for a model parameter
124            @param parameter: name of the parameter [string]
125            @dispersion: dispersion object of type DispersionModel
126        """
127        return CCoreShellCylinderModel.set_dispersion(self, parameter, dispersion.cdisp)
128       
129   
130# End of file
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