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56  <div class="section" id="powerlawmodel">
57<h1>PowerLawModel<a class="headerlink" href="#powerlawmodel" title="Permalink to this headline">¶</a></h1>
58<div class="section" id="module-sans.models.PowerLawModel">
59<span id="sans-models-powerlawmodel"></span><h2><a class="reference internal" href="#module-sans.models.PowerLawModel"><tt class="xref py py-mod docutils literal"><span class="pre">sans.models.PowerLawModel</span></tt></a><a class="headerlink" href="#module-sans.models.PowerLawModel" title="Permalink to this headline">¶</a></h2>
60<p>Provide F(x) = scale* (x)^(-m) + bkd
61Power law function as a BaseComponent model</p>
62<dl class="class">
63<dt id="sans.models.PowerLawModel.PowerLawModel">
64<em class="property">class </em><tt class="descclassname">sans.models.PowerLawModel.</tt><tt class="descname">PowerLawModel</tt><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel" title="Permalink to this definition">¶</a></dt>
65<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>
66<p>Class that evaluates a Power_Law model.</p>
67<p>F(x) = scale* (x)^(-m) + bkd</p>
68<dl class="docutils">
69<dt>The model has three parameters: </dt>
70<dd>m     =  power
71scale  =  scale factor
72bkd    =  incoherent background</dd>
73</dl>
74<dl class="method">
75<dt id="sans.models.PowerLawModel.PowerLawModel.calculate_ER">
76<tt class="descname">calculate_ER</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.calculate_ER" title="Permalink to this definition">¶</a></dt>
77<dd></dd></dl>
78
79<dl class="method">
80<dt id="sans.models.PowerLawModel.PowerLawModel.clone">
81<tt class="descname">clone</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.clone" title="Permalink to this definition">¶</a></dt>
82<dd>Returns a new object identical to the current object</dd></dl>
83
84<dl class="method">
85<dt id="sans.models.PowerLawModel.PowerLawModel.evalDistribution">
86<tt class="descname">evalDistribution</tt><big>(</big><em>qdist</em><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.evalDistribution" title="Permalink to this definition">¶</a></dt>
87<dd><p>Evaluate a distribution of q-values.</p>
88<ul>
89<li><p class="first">For 1D, a numpy array is expected as input:</p>
90<blockquote>
91<p>evalDistribution(q)</p>
92</blockquote>
93</li>
94</ul>
95<p>where q is a numpy array.</p>
96<ul class="simple">
97<li>For 2D, a list of numpy arrays are expected: [qx_prime,qy_prime],
98where 1D arrays,</li>
99</ul>
100<p>qx_prime = [ qx[0], qx[1], qx[2], ....]
101and
102qy_prime = [ qy[0], qy[1], qy[2], ....]</p>
103<p>Then get
104q = numpy.sqrt(qx_prime^2+qy_prime^2)</p>
105<p>that is a qr in 1D array;
106q = [q[0], q[1], q[2], ....]</p>
107<table class="docutils field-list" frame="void" rules="none">
108<col class="field-name" />
109<col class="field-body" />
110<tbody valign="top">
111<tr class="field"><th class="field-name">Note :</th><td class="field-body"><p class="first">Due to 2D speed issue, no anisotropic scattering
112is supported for python models, thus C-models should have</p>
113<blockquote class="last">
114<p>their own evalDistribution methods.</p>
115</blockquote>
116</td>
117</tr>
118</tbody>
119</table>
120<p>The method is then called the following way:</p>
121<p>evalDistribution(q)
122where q is a numpy array.</p>
123<table class="docutils field-list" frame="void" rules="none">
124<col class="field-name" />
125<col class="field-body" />
126<tbody valign="top">
127<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
128<li><strong>qdist</strong> &#8211; ndarray of scalar q-values or list [qx,qy]
129where qx,qy are 1D ndarrays</li>
130</ul>
131</td>
132</tr>
133</tbody>
134</table>
135</dd></dl>
136
137<dl class="method">
138<dt id="sans.models.PowerLawModel.PowerLawModel.getDispParamList">
139<tt class="descname">getDispParamList</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.getDispParamList" title="Permalink to this definition">¶</a></dt>
140<dd>Return a list of all available parameters for the model</dd></dl>
141
142<dl class="method">
143<dt id="sans.models.PowerLawModel.PowerLawModel.getParam">
144<tt class="descname">getParam</tt><big>(</big><em>name</em><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.getParam" title="Permalink to this definition">¶</a></dt>
145<dd><p>Set the value of a model parameter</p>
146<table class="docutils field-list" frame="void" rules="none">
147<col class="field-name" />
148<col class="field-body" />
149<tbody valign="top">
150<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
151<li><strong>name</strong> &#8211; name of the parameter</li>
152</ul>
153</td>
154</tr>
155</tbody>
156</table>
157</dd></dl>
158
159<dl class="method">
160<dt id="sans.models.PowerLawModel.PowerLawModel.getParamList">
161<tt class="descname">getParamList</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.getParamList" title="Permalink to this definition">¶</a></dt>
162<dd>Return a list of all available parameters for the model</dd></dl>
163
164<dl class="method">
165<dt id="sans.models.PowerLawModel.PowerLawModel.getParamListWithToken">
166<tt class="descname">getParamListWithToken</tt><big>(</big><em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.getParamListWithToken" title="Permalink to this definition">¶</a></dt>
167<dd></dd></dl>
168
169<dl class="method">
170<dt id="sans.models.PowerLawModel.PowerLawModel.getParamWithToken">
171<tt class="descname">getParamWithToken</tt><big>(</big><em>name</em>, <em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.getParamWithToken" title="Permalink to this definition">¶</a></dt>
172<dd></dd></dl>
173
174<dl class="method">
175<dt id="sans.models.PowerLawModel.PowerLawModel.is_fittable">
176<tt class="descname">is_fittable</tt><big>(</big><em>par_name</em><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.is_fittable" title="Permalink to this definition">¶</a></dt>
177<dd><p>Check if a given parameter is fittable or not</p>
178<table class="docutils field-list" frame="void" rules="none">
179<col class="field-name" />
180<col class="field-body" />
181<tbody valign="top">
182<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
183<li><strong>par_name</strong> &#8211; the parameter name to check</li>
184</ul>
185</td>
186</tr>
187</tbody>
188</table>
189</dd></dl>
190
191<dl class="method">
192<dt id="sans.models.PowerLawModel.PowerLawModel.run">
193<tt class="descname">run</tt><big>(</big><em>x=0.0</em><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.run" title="Permalink to this definition">¶</a></dt>
194<dd>Evaluate the model
195&#64;param x: input q-value (float or [float, float] as [r, theta])
196&#64;return: (PowerLaw value)</dd></dl>
197
198<dl class="method">
199<dt id="sans.models.PowerLawModel.PowerLawModel.runXY">
200<tt class="descname">runXY</tt><big>(</big><em>x=0.0</em><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.runXY" title="Permalink to this definition">¶</a></dt>
201<dd>Evaluate the model
202&#64;param x: input q-value (float or [float, float] as [qx, qy])
203&#64;return: PowerLaw value</dd></dl>
204
205<dl class="method">
206<dt id="sans.models.PowerLawModel.PowerLawModel.setParam">
207<tt class="descname">setParam</tt><big>(</big><em>name</em>, <em>value</em><big>)</big><a class="headerlink" href="#sans.models.PowerLawModel.PowerLawModel.setParam" title="Permalink to this definition">¶</a></dt>
208<dd><p>Set the value of a model parameter</p>
209<table class="docutils field-list" frame="void" rules="none">
210<col class="field-name" />
211<col class="field-body" />
212<tbody valign="top">
213<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
214<li><strong>name</strong> &#8211; name of the parameter</li>
215<li><strong>value</strong> &#8211; value of the parameter</li>
216</ul>
217</td>
218</tr>
219</tbody>
220</table>
221</dd></dl>
222
223<dl class="method">
224<dt id="sans.models.PowerLawModel.PowerLawModel.setParamWithToken">
225<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.PowerLawModel.PowerLawModel.setParamWithToken" title="Permalink to this definition">¶</a></dt>
226<dd></dd></dl>
227
228</dd></dl>
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