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56  <div class="section" id="constant">
57<h1>Constant<a class="headerlink" href="#constant" title="Permalink to this headline">¶</a></h1>
58<div class="section" id="module-sans.models.Constant">
59<span id="sans-models-constant"></span><h2><a class="reference internal" href="#module-sans.models.Constant"><tt class="xref py py-mod docutils literal"><span class="pre">sans.models.Constant</span></tt></a><a class="headerlink" href="#module-sans.models.Constant" title="Permalink to this headline">¶</a></h2>
60<p>Provide constant function as a BaseComponent model</p>
61<dl class="class">
62<dt id="sans.models.Constant.Constant">
63<em class="property">class </em><tt class="descclassname">sans.models.Constant.</tt><tt class="descname">Constant</tt><a class="headerlink" href="#sans.models.Constant.Constant" title="Permalink to this definition">¶</a></dt>
64<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>
65<p>Class that evaluates a constant model.
66List of default parameters:</p>
67<blockquote>
68value           = 1.0</blockquote>
69<dl class="method">
70<dt id="sans.models.Constant.Constant.calculate_ER">
71<tt class="descname">calculate_ER</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.calculate_ER" title="Permalink to this definition">¶</a></dt>
72<dd></dd></dl>
73
74<dl class="method">
75<dt id="sans.models.Constant.Constant.clone">
76<tt class="descname">clone</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.clone" title="Permalink to this definition">¶</a></dt>
77<dd>Return a identical copy of self</dd></dl>
78
79<dl class="method">
80<dt id="sans.models.Constant.Constant.evalDistribution">
81<tt class="descname">evalDistribution</tt><big>(</big><em>qdist</em><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.evalDistribution" title="Permalink to this definition">¶</a></dt>
82<dd><p>Evaluate a distribution of q-values.</p>
83<ul>
84<li><p class="first">For 1D, a numpy array is expected as input:</p>
85<blockquote>
86<p>evalDistribution(q)</p>
87</blockquote>
88</li>
89</ul>
90<p>where q is a numpy array.</p>
91<ul class="simple">
92<li>For 2D, a list of numpy arrays are expected: [qx_prime,qy_prime],
93where 1D arrays,</li>
94</ul>
95<p>qx_prime = [ qx[0], qx[1], qx[2], ....]
96and
97qy_prime = [ qy[0], qy[1], qy[2], ....]</p>
98<p>Then get
99q = numpy.sqrt(qx_prime^2+qy_prime^2)</p>
100<p>that is a qr in 1D array;
101q = [q[0], q[1], q[2], ....]</p>
102<table class="docutils field-list" frame="void" rules="none">
103<col class="field-name" />
104<col class="field-body" />
105<tbody valign="top">
106<tr class="field"><th class="field-name">Note :</th><td class="field-body"><p class="first">Due to 2D speed issue, no anisotropic scattering
107is supported for python models, thus C-models should have</p>
108<blockquote class="last">
109<p>their own evalDistribution methods.</p>
110</blockquote>
111</td>
112</tr>
113</tbody>
114</table>
115<p>The method is then called the following way:</p>
116<p>evalDistribution(q)
117where q is a numpy array.</p>
118<table class="docutils field-list" frame="void" rules="none">
119<col class="field-name" />
120<col class="field-body" />
121<tbody valign="top">
122<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
123<li><strong>qdist</strong> &#8211; ndarray of scalar q-values or list [qx,qy]
124where qx,qy are 1D ndarrays</li>
125</ul>
126</td>
127</tr>
128</tbody>
129</table>
130</dd></dl>
131
132<dl class="method">
133<dt id="sans.models.Constant.Constant.getDispParamList">
134<tt class="descname">getDispParamList</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.getDispParamList" title="Permalink to this definition">¶</a></dt>
135<dd>Return a list of all available parameters for the model</dd></dl>
136
137<dl class="method">
138<dt id="sans.models.Constant.Constant.getParam">
139<tt class="descname">getParam</tt><big>(</big><em>name</em><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.getParam" title="Permalink to this definition">¶</a></dt>
140<dd><p>Set the value of a model parameter</p>
141<table class="docutils field-list" frame="void" rules="none">
142<col class="field-name" />
143<col class="field-body" />
144<tbody valign="top">
145<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
146<li><strong>name</strong> &#8211; name of the parameter</li>
147</ul>
148</td>
149</tr>
150</tbody>
151</table>
152</dd></dl>
153
154<dl class="method">
155<dt id="sans.models.Constant.Constant.getParamList">
156<tt class="descname">getParamList</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.getParamList" title="Permalink to this definition">¶</a></dt>
157<dd>Return a list of all available parameters for the model</dd></dl>
158
159<dl class="method">
160<dt id="sans.models.Constant.Constant.getParamListWithToken">
161<tt class="descname">getParamListWithToken</tt><big>(</big><em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.getParamListWithToken" title="Permalink to this definition">¶</a></dt>
162<dd></dd></dl>
163
164<dl class="method">
165<dt id="sans.models.Constant.Constant.getParamWithToken">
166<tt class="descname">getParamWithToken</tt><big>(</big><em>name</em>, <em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.getParamWithToken" title="Permalink to this definition">¶</a></dt>
167<dd></dd></dl>
168
169<dl class="method">
170<dt id="sans.models.Constant.Constant.is_fittable">
171<tt class="descname">is_fittable</tt><big>(</big><em>par_name</em><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.is_fittable" title="Permalink to this definition">¶</a></dt>
172<dd><p>Check if a given parameter is fittable or not</p>
173<table class="docutils field-list" frame="void" rules="none">
174<col class="field-name" />
175<col class="field-body" />
176<tbody valign="top">
177<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
178<li><strong>par_name</strong> &#8211; the parameter name to check</li>
179</ul>
180</td>
181</tr>
182</tbody>
183</table>
184</dd></dl>
185
186<dl class="method">
187<dt id="sans.models.Constant.Constant.run">
188<tt class="descname">run</tt><big>(</big><em>x=0.0</em><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.run" title="Permalink to this definition">¶</a></dt>
189<dd>Evaluate the model
190&#64;param x: unused
191&#64;return: (constant value)</dd></dl>
192
193<dl class="method">
194<dt id="sans.models.Constant.Constant.runXY">
195<tt class="descname">runXY</tt><big>(</big><em>x=0.0</em><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.runXY" title="Permalink to this definition">¶</a></dt>
196<dd>Evaluate the model
197&#64;param x: unused
198&#64;return: constant value</dd></dl>
199
200<dl class="method">
201<dt id="sans.models.Constant.Constant.setParam">
202<tt class="descname">setParam</tt><big>(</big><em>name</em>, <em>value</em><big>)</big><a class="headerlink" href="#sans.models.Constant.Constant.setParam" title="Permalink to this definition">¶</a></dt>
203<dd><p>Set the value of a model parameter</p>
204<table class="docutils field-list" frame="void" rules="none">
205<col class="field-name" />
206<col class="field-body" />
207<tbody valign="top">
208<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
209<li><strong>name</strong> &#8211; name of the parameter</li>
210<li><strong>value</strong> &#8211; value of the parameter</li>
211</ul>
212</td>
213</tr>
214</tbody>
215</table>
216</dd></dl>
217
218<dl class="method">
219<dt id="sans.models.Constant.Constant.setParamWithToken">
220<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.Constant.Constant.setParamWithToken" title="Permalink to this definition">¶</a></dt>
221<dd></dd></dl>
222
223</dd></dl>
224
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