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56  <div class="section" id="debyemodel">
57<h1>DebyeModel<a class="headerlink" href="#debyemodel" title="Permalink to this headline">¶</a></h1>
58<div class="section" id="module-sans.models.DebyeModel">
59<span id="sans-models-debyemodel"></span><h2><a class="reference internal" href="#module-sans.models.DebyeModel" title="sans.models.DebyeModel"><tt class="xref py py-mod docutils literal"><span class="pre">sans.models.DebyeModel</span></tt></a><a class="headerlink" href="#module-sans.models.DebyeModel" title="Permalink to this headline">¶</a></h2>
60<p>Provide F(x) = 2( exp(-x) + x - 1 )/x**2
61with x = (q*R_g)**2</p>
62<p>Debye function as a BaseComponent model</p>
63<dl class="class">
64<dt id="sans.models.DebyeModel.DebyeModel">
65<em class="property">class </em><tt class="descclassname">sans.models.DebyeModel.</tt><tt class="descname">DebyeModel</tt><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel" title="Permalink to this definition">¶</a></dt>
66<dd><p>Bases: <a class="reference internal" href="BaseComponent.html#sans.models.BaseComponent.BaseComponent" title="sans.models.BaseComponent.BaseComponent"><tt class="xref py py-class docutils literal"><span class="pre">sans.models.BaseComponent.BaseComponent</span></tt></a></p>
67<p>Class that evaluates a Debye model.</p>
68<p>F(x) = 2( exp(-x) + x - 1 )/x**2
69with x = (q*R_g)**2</p>
70<dl class="docutils">
71<dt>The model has three parameters: </dt>
72<dd>Rg     =  radius of gyration
73scale  =  scale factor
74bkd    =  Constant background</dd>
75</dl>
76<dl class="method">
77<dt id="sans.models.DebyeModel.DebyeModel.calculate_ER">
78<tt class="descname">calculate_ER</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.calculate_ER" title="Permalink to this definition">¶</a></dt>
79<dd></dd></dl>
80
81<dl class="method">
82<dt id="sans.models.DebyeModel.DebyeModel.clone">
83<tt class="descname">clone</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.clone" title="Permalink to this definition">¶</a></dt>
84<dd><p>Returns a new object identical to the current object</p>
85</dd></dl>
86
87<dl class="method">
88<dt id="sans.models.DebyeModel.DebyeModel.evalDistribution">
89<tt class="descname">evalDistribution</tt><big>(</big><em>qdist</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.evalDistribution" title="Permalink to this definition">¶</a></dt>
90<dd><p>Evaluate a distribution of q-values.</p>
91<ul>
92<li><p class="first">For 1D, a numpy array is expected as input:</p>
93<blockquote>
94<div><p>evalDistribution(q)</p>
95</div></blockquote>
96</li>
97</ul>
98<p>where q is a numpy array.</p>
99<ul class="simple">
100<li>For 2D, a list of numpy arrays are expected: [qx_prime,qy_prime],
101where 1D arrays,</li>
102</ul>
103<p>qx_prime = [ qx[0], qx[1], qx[2], ....]
104and
105qy_prime = [ qy[0], qy[1], qy[2], ....]</p>
106<p>Then get
107q = numpy.sqrt(qx_prime^2+qy_prime^2)</p>
108<p>that is a qr in 1D array;
109q = [q[0], q[1], q[2], ....]</p>
110<table class="docutils field-list" frame="void" rules="none">
111<col class="field-name" />
112<col class="field-body" />
113<tbody valign="top">
114<tr class="field"><th class="field-name">Note :</th><td class="field-body"><p class="first">Due to 2D speed issue, no anisotropic scattering
115is supported for python models, thus C-models should have</p>
116<blockquote class="last">
117<div><p>their own evalDistribution methods.</p>
118</div></blockquote>
119</td>
120</tr>
121</tbody>
122</table>
123<p>The method is then called the following way:</p>
124<p>evalDistribution(q)
125where q is a numpy array.</p>
126<table class="docutils field-list" frame="void" rules="none">
127<col class="field-name" />
128<col class="field-body" />
129<tbody valign="top">
130<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>qdist</strong> &#8211; ndarray of scalar q-values or list [qx,qy]
131where qx,qy are 1D ndarrays</td>
132</tr>
133</tbody>
134</table>
135</dd></dl>
136
137<dl class="method">
138<dt id="sans.models.DebyeModel.DebyeModel.getDispParamList">
139<tt class="descname">getDispParamList</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.getDispParamList" title="Permalink to this definition">¶</a></dt>
140<dd><p>Return a list of all available parameters for the model</p>
141</dd></dl>
142
143<dl class="method">
144<dt id="sans.models.DebyeModel.DebyeModel.getParam">
145<tt class="descname">getParam</tt><big>(</big><em>name</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.getParam" title="Permalink to this definition">¶</a></dt>
146<dd><p>Set the value of a model parameter</p>
147<table class="docutils field-list" frame="void" rules="none">
148<col class="field-name" />
149<col class="field-body" />
150<tbody valign="top">
151<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>name</strong> &#8211; name of the parameter</td>
152</tr>
153</tbody>
154</table>
155</dd></dl>
156
157<dl class="method">
158<dt id="sans.models.DebyeModel.DebyeModel.getParamList">
159<tt class="descname">getParamList</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.getParamList" title="Permalink to this definition">¶</a></dt>
160<dd><p>Return a list of all available parameters for the model</p>
161</dd></dl>
162
163<dl class="method">
164<dt id="sans.models.DebyeModel.DebyeModel.getParamListWithToken">
165<tt class="descname">getParamListWithToken</tt><big>(</big><em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.getParamListWithToken" title="Permalink to this definition">¶</a></dt>
166<dd></dd></dl>
167
168<dl class="method">
169<dt id="sans.models.DebyeModel.DebyeModel.getParamWithToken">
170<tt class="descname">getParamWithToken</tt><big>(</big><em>name</em>, <em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.getParamWithToken" title="Permalink to this definition">¶</a></dt>
171<dd></dd></dl>
172
173<dl class="method">
174<dt id="sans.models.DebyeModel.DebyeModel.is_fittable">
175<tt class="descname">is_fittable</tt><big>(</big><em>par_name</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.is_fittable" title="Permalink to this definition">¶</a></dt>
176<dd><p>Check if a given parameter is fittable or not</p>
177<table class="docutils field-list" frame="void" rules="none">
178<col class="field-name" />
179<col class="field-body" />
180<tbody valign="top">
181<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>par_name</strong> &#8211; the parameter name to check</td>
182</tr>
183</tbody>
184</table>
185</dd></dl>
186
187<dl class="method">
188<dt id="sans.models.DebyeModel.DebyeModel.run">
189<tt class="descname">run</tt><big>(</big><em>x=0.0</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.run" title="Permalink to this definition">¶</a></dt>
190<dd><p>Evaluate the model
191&#64;param x: input q-value (float or [float, float] as [r, theta])
192&#64;return: (debye value)</p>
193</dd></dl>
194
195<dl class="method">
196<dt id="sans.models.DebyeModel.DebyeModel.runXY">
197<tt class="descname">runXY</tt><big>(</big><em>x=0.0</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.runXY" title="Permalink to this definition">¶</a></dt>
198<dd><p>Evaluate the model
199&#64;param x: input q-value (float or [float, float] as [qx, qy])
200&#64;return: debye value</p>
201</dd></dl>
202
203<dl class="method">
204<dt id="sans.models.DebyeModel.DebyeModel.setParam">
205<tt class="descname">setParam</tt><big>(</big><em>name</em>, <em>value</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.setParam" title="Permalink to this definition">¶</a></dt>
206<dd><p>Set the value of a model parameter</p>
207<table class="docutils field-list" frame="void" rules="none">
208<col class="field-name" />
209<col class="field-body" />
210<tbody valign="top">
211<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
212<li><strong>name</strong> &#8211; name of the parameter</li>
213<li><strong>value</strong> &#8211; value of the parameter</li>
214</ul>
215</td>
216</tr>
217</tbody>
218</table>
219</dd></dl>
220
221<dl class="method">
222<dt id="sans.models.DebyeModel.DebyeModel.setParamWithToken">
223<tt class="descname">setParamWithToken</tt><big>(</big><em>name</em>, <em>value</em>, <em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.DebyeModel.DebyeModel.setParamWithToken" title="Permalink to this definition">¶</a></dt>
224<dd></dd></dl>
225
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