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