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