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56  <div class="section" id="twopowerlawmodel">
57<h1>TwoPowerLawModel<a class="headerlink" href="#twopowerlawmodel" title="Permalink to this headline">¶</a></h1>
58<div class="section" id="module-sans.models.TwoPowerLawModel">
59<span id="sans-models-twopowerlawmodel"></span><h2><a class="reference internal" href="#module-sans.models.TwoPowerLawModel" title="sans.models.TwoPowerLawModel"><tt class="xref py py-mod docutils literal"><span class="pre">sans.models.TwoPowerLawModel</span></tt></a><a class="headerlink" href="#module-sans.models.TwoPowerLawModel" title="Permalink to this headline">¶</a></h2>
60<dl class="docutils">
61<dt>Provide I(q) = A*pow(qval,-1.0*m1) for q&lt;=qc</dt>
62<dd>=scale*pow(qval,-1.0*m2) for q&gt;qc</dd>
63</dl>
64<p>TwoPowerLaw function as a BaseComponent model</p>
65<dl class="class">
66<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel">
67<em class="property">class </em><tt class="descclassname">sans.models.TwoPowerLawModel.</tt><tt class="descname">TwoPowerLawModel</tt><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel" title="Permalink to this definition">¶</a></dt>
68<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>
69<p>Class that evaluates a TwoPowerLawModel.</p>
70<dl class="docutils">
71<dt>I(q) = coef_A*pow(qval,-1.0*power1) for q&lt;=qc</dt>
72<dd>=C*pow(qval,-1.0*power2) for q&gt;qc</dd>
73</dl>
74<p>where C=coef_A*pow(qc,-1.0*power1)/pow(qc,-1.0*power2).
75List of default parameters:</p>
76<blockquote>
77<div>coef_A = coefficient
78power1 = (-) Power &#64; low Q
79power2 = (-) Power &#64; high Q
80qc = crossover Q-value
81background = incoherent background</div></blockquote>
82<dl class="method">
83<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.calculate_ER">
84<tt class="descname">calculate_ER</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.calculate_ER" title="Permalink to this definition">¶</a></dt>
85<dd></dd></dl>
86
87<dl class="method">
88<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.clone">
89<tt class="descname">clone</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.clone" title="Permalink to this definition">¶</a></dt>
90<dd><p>Returns a new object identical to the current object</p>
91</dd></dl>
92
93<dl class="method">
94<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.evalDistribution">
95<tt class="descname">evalDistribution</tt><big>(</big><em>qdist</em><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.evalDistribution" title="Permalink to this definition">¶</a></dt>
96<dd><p>Evaluate a distribution of q-values.</p>
97<ul>
98<li><p class="first">For 1D, a numpy array is expected as input:</p>
99<blockquote>
100<div><p>evalDistribution(q)</p>
101</div></blockquote>
102</li>
103</ul>
104<p>where q is a numpy array.</p>
105<ul class="simple">
106<li>For 2D, a list of numpy arrays are expected: [qx_prime,qy_prime],
107where 1D arrays,</li>
108</ul>
109<p>qx_prime = [ qx[0], qx[1], qx[2], ....]
110and
111qy_prime = [ qy[0], qy[1], qy[2], ....]</p>
112<p>Then get
113q = numpy.sqrt(qx_prime^2+qy_prime^2)</p>
114<p>that is a qr in 1D array;
115q = [q[0], q[1], q[2], ....]</p>
116<table class="docutils field-list" frame="void" rules="none">
117<col class="field-name" />
118<col class="field-body" />
119<tbody valign="top">
120<tr class="field"><th class="field-name">Note :</th><td class="field-body"><p class="first">Due to 2D speed issue, no anisotropic scattering
121is supported for python models, thus C-models should have</p>
122<blockquote class="last">
123<div><p>their own evalDistribution methods.</p>
124</div></blockquote>
125</td>
126</tr>
127</tbody>
128</table>
129<p>The method is then called the following way:</p>
130<p>evalDistribution(q)
131where q is a numpy array.</p>
132<table class="docutils field-list" frame="void" rules="none">
133<col class="field-name" />
134<col class="field-body" />
135<tbody valign="top">
136<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]
137where qx,qy are 1D ndarrays</td>
138</tr>
139</tbody>
140</table>
141</dd></dl>
142
143<dl class="method">
144<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.getDispParamList">
145<tt class="descname">getDispParamList</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.getDispParamList" title="Permalink to this definition">¶</a></dt>
146<dd><p>Return a list of all available parameters for the model</p>
147</dd></dl>
148
149<dl class="method">
150<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.getParam">
151<tt class="descname">getParam</tt><big>(</big><em>name</em><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.getParam" title="Permalink to this definition">¶</a></dt>
152<dd><p>Set the value of a model parameter</p>
153<table class="docutils field-list" frame="void" rules="none">
154<col class="field-name" />
155<col class="field-body" />
156<tbody valign="top">
157<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>name</strong> &#8211; name of the parameter</td>
158</tr>
159</tbody>
160</table>
161</dd></dl>
162
163<dl class="method">
164<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.getParamList">
165<tt class="descname">getParamList</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.getParamList" title="Permalink to this definition">¶</a></dt>
166<dd><p>Return a list of all available parameters for the model</p>
167</dd></dl>
168
169<dl class="method">
170<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.getParamListWithToken">
171<tt class="descname">getParamListWithToken</tt><big>(</big><em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.getParamListWithToken" title="Permalink to this definition">¶</a></dt>
172<dd></dd></dl>
173
174<dl class="method">
175<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.getParamWithToken">
176<tt class="descname">getParamWithToken</tt><big>(</big><em>name</em>, <em>token</em>, <em>member</em><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.getParamWithToken" title="Permalink to this definition">¶</a></dt>
177<dd></dd></dl>
178
179<dl class="method">
180<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.is_fittable">
181<tt class="descname">is_fittable</tt><big>(</big><em>par_name</em><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.is_fittable" title="Permalink to this definition">¶</a></dt>
182<dd><p>Check if a given parameter is fittable or not</p>
183<table class="docutils field-list" frame="void" rules="none">
184<col class="field-name" />
185<col class="field-body" />
186<tbody valign="top">
187<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>par_name</strong> &#8211; the parameter name to check</td>
188</tr>
189</tbody>
190</table>
191</dd></dl>
192
193<dl class="method">
194<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.run">
195<tt class="descname">run</tt><big>(</big><em>x=0.0</em><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.run" title="Permalink to this definition">¶</a></dt>
196<dd><p>Evaluate the model
197&#64;param x: input q-value (float or [float, float] as [r, theta])
198&#64;return: (guinier value)</p>
199</dd></dl>
200
201<dl class="method">
202<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.runXY">
203<tt class="descname">runXY</tt><big>(</big><em>x=0.0</em><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.runXY" title="Permalink to this definition">¶</a></dt>
204<dd><p>Evaluate the model
205&#64;param x: input q-value (float or [float, float] as [qx, qy])
206&#64;return: guinier value</p>
207</dd></dl>
208
209<dl class="method">
210<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.setParam">
211<tt class="descname">setParam</tt><big>(</big><em>name</em>, <em>value</em><big>)</big><a class="headerlink" href="#sans.models.TwoPowerLawModel.TwoPowerLawModel.setParam" title="Permalink to this definition">¶</a></dt>
212<dd><p>Set the value of a model parameter</p>
213<table class="docutils field-list" frame="void" rules="none">
214<col class="field-name" />
215<col class="field-body" />
216<tbody valign="top">
217<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
218<li><strong>name</strong> &#8211; name of the parameter</li>
219<li><strong>value</strong> &#8211; value of the parameter</li>
220</ul>
221</td>
222</tr>
223</tbody>
224</table>
225</dd></dl>
226
227<dl class="method">
228<dt id="sans.models.TwoPowerLawModel.TwoPowerLawModel.setParamWithToken">
229<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.TwoPowerLawModel.TwoPowerLawModel.setParamWithToken" title="Permalink to this definition">¶</a></dt>
230<dd></dd></dl>
231
232</dd></dl>
233
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