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56  <div class="section" id="invertor">
57<h1>invertor<a class="headerlink" href="#invertor" title="Permalink to this headline">¶</a></h1>
58<div class="section" id="module-sans.pr.invertor">
59<span id="sans-pr-invertor"></span><h2><a class="reference internal" href="#module-sans.pr.invertor"><tt class="xref py py-mod docutils literal"><span class="pre">sans.pr.invertor</span></tt></a><a class="headerlink" href="#module-sans.pr.invertor" title="Permalink to this headline">¶</a></h2>
60<p>Module to perform P(r) inversion.
61The module contains the Invertor class.</p>
62<dl class="class">
63<dt id="sans.pr.invertor.Invertor">
64<em class="property">class </em><tt class="descclassname">sans.pr.invertor.</tt><tt class="descname">Invertor</tt><a class="headerlink" href="#sans.pr.invertor.Invertor" title="Permalink to this definition">¶</a></dt>
65<dd><p>Bases: <tt class="xref py py-class docutils literal"><span class="pre">Cinvertor</span></tt></p>
66<p>Invertor class to perform P(r) inversion</p>
67<p>The problem is solved by posing the problem as  Ax = b,
68where x is the set of coefficients we are looking for.</p>
69<p>Npts is the number of points.</p>
70<p>In the following i refers to the ith base function coefficient.
71The matrix has its entries j in its first Npts rows set to</p>
72<blockquote>
73A[j][i] = (Fourier transformed base function for point j)</blockquote>
74<p>We them choose a number of r-points, n_r, to evaluate the second
75derivative of P(r) at. This is used as our regularization term.
76For a vector r of length n_r, the following n_r rows are set to</p>
77<blockquote>
78A[j+Npts][i] = (2nd derivative of P(r), d**2(P(r))/d(r)**2, evaluated at r[j])</blockquote>
79<dl class="docutils">
80<dt>The vector b has its first Npts entries set to</dt>
81<dd>b[j] = (I(q) observed for point j)</dd>
82</dl>
83<p>The following n_r entries are set to zero.</p>
84<p>The result is found by using scipy.linalg.basic.lstsq to invert
85the matrix and find the coefficients x.</p>
86<p>Methods inherited from Cinvertor:
87- get_peaks(pars): returns the number of P(r) peaks
88- oscillations(pars): returns the oscillation parameters for the output P(r)
89- get_positive(pars): returns the fraction of P(r) that is above zero
90- get_pos_err(pars): returns the fraction of P(r) that is 1-sigma above zero</p>
91<dl class="attribute">
92<dt id="sans.pr.invertor.Invertor.basefunc_ft">
93<tt class="descname">basefunc_ft</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.basefunc_ft" title="Permalink to this definition">¶</a></dt>
94<dd>Returns the value of the nth Fourier transofrmed base function
95&#64;param args: c-parameters, n and q
96&#64;return: nth Fourier transformed base function, evaluated at q</dd></dl>
97
98<dl class="method">
99<dt id="sans.pr.invertor.Invertor.clone">
100<tt class="descname">clone</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.clone" title="Permalink to this definition">¶</a></dt>
101<dd>Return a clone of this instance</dd></dl>
102
103<dl class="method">
104<dt id="sans.pr.invertor.Invertor.estimate_alpha">
105<tt class="descname">estimate_alpha</tt><big>(</big><em>nfunc</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.estimate_alpha" title="Permalink to this definition">¶</a></dt>
106<dd><p>Returns a reasonable guess for the
107regularization constant alpha</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">Parameters:</th><td class="field-body"><ul class="first simple">
113<li><strong>nfunc</strong> &#8211; number of terms to use in the expansion.</li>
114</ul>
115</td>
116</tr>
117<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">alpha, message, elapsed</p>
118</td>
119</tr>
120</tbody>
121</table>
122<p>where alpha is the estimate for alpha,
123message is a message for the user,
124elapsed is the computation time</p>
125</dd></dl>
126
127<dl class="method">
128<dt id="sans.pr.invertor.Invertor.estimate_numterms">
129<tt class="descname">estimate_numterms</tt><big>(</big><em>isquit_func=None</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.estimate_numterms" title="Permalink to this definition">¶</a></dt>
130<dd><p>Returns a reasonable guess for the
131number of terms</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"><ul class="first simple">
137<li><strong>isquit_func</strong> &#8211; reference to thread function to call to
138check whether the computation needs to
139be stopped.</li>
140</ul>
141</td>
142</tr>
143<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">number of terms, alpha, message</p>
144</td>
145</tr>
146</tbody>
147</table>
148</dd></dl>
149
150<dl class="method">
151<dt id="sans.pr.invertor.Invertor.from_file">
152<tt class="descname">from_file</tt><big>(</big><em>path</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.from_file" title="Permalink to this definition">¶</a></dt>
153<dd><p>Load the state of the Invertor from a file,
154to be able to generate P(r) from a set of
155parameters.</p>
156<table class="docutils field-list" frame="void" rules="none">
157<col class="field-name" />
158<col class="field-body" />
159<tbody valign="top">
160<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
161<li><strong>path</strong> &#8211; path of the file to load</li>
162</ul>
163</td>
164</tr>
165</tbody>
166</table>
167</dd></dl>
168
169<dl class="attribute">
170<dt id="sans.pr.invertor.Invertor.get_alpha">
171<tt class="descname">get_alpha</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_alpha" title="Permalink to this definition">¶</a></dt>
172<dd>Gets the alpha parameter</dd></dl>
173
174<dl class="attribute">
175<dt id="sans.pr.invertor.Invertor.get_dmax">
176<tt class="descname">get_dmax</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_dmax" title="Permalink to this definition">¶</a></dt>
177<dd>Gets the maximum distance</dd></dl>
178
179<dl class="attribute">
180<dt id="sans.pr.invertor.Invertor.get_err">
181<tt class="descname">get_err</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_err" title="Permalink to this definition">¶</a></dt>
182<dd><p>Function to get the err data
183Takes an array of doubles as input.</p>
184<blockquote>
185&#64;return: number of entries found</blockquote>
186</dd></dl>
187
188<dl class="attribute">
189<dt id="sans.pr.invertor.Invertor.get_has_bck">
190<tt class="descname">get_has_bck</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_has_bck" title="Permalink to this definition">¶</a></dt>
191<dd>Gets background flag</dd></dl>
192
193<dl class="attribute">
194<dt id="sans.pr.invertor.Invertor.get_nerr">
195<tt class="descname">get_nerr</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_nerr" title="Permalink to this definition">¶</a></dt>
196<dd>Gets the number of err points</dd></dl>
197
198<dl class="attribute">
199<dt id="sans.pr.invertor.Invertor.get_nx">
200<tt class="descname">get_nx</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_nx" title="Permalink to this definition">¶</a></dt>
201<dd>Gets the number of x points</dd></dl>
202
203<dl class="attribute">
204<dt id="sans.pr.invertor.Invertor.get_ny">
205<tt class="descname">get_ny</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_ny" title="Permalink to this definition">¶</a></dt>
206<dd>Gets the number of y points</dd></dl>
207
208<dl class="attribute">
209<dt id="sans.pr.invertor.Invertor.get_peaks">
210<tt class="descname">get_peaks</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_peaks" title="Permalink to this definition">¶</a></dt>
211<dd><p>Returns the number of peaks in the output P(r) distrubution
212for the given set of coefficients.</p>
213<blockquote>
214&#64;param args: c-parameters
215&#64;return: number of P(r) peaks</blockquote>
216</dd></dl>
217
218<dl class="attribute">
219<dt id="sans.pr.invertor.Invertor.get_pos_err">
220<tt class="descname">get_pos_err</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_pos_err" title="Permalink to this definition">¶</a></dt>
221<dd><p>Returns the fraction of P(r) that is 1 standard deviation
222above zero over the full range of r for the given set of coefficients.</p>
223<blockquote>
224&#64;param args: c-parameters
225&#64;return: fraction of P(r) that is positive</blockquote>
226</dd></dl>
227
228<dl class="attribute">
229<dt id="sans.pr.invertor.Invertor.get_positive">
230<tt class="descname">get_positive</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_positive" title="Permalink to this definition">¶</a></dt>
231<dd><p>Returns the fraction of P(r) that is positive over
232the full range of r for the given set of coefficients.</p>
233<blockquote>
234&#64;param args: c-parameters
235&#64;return: fraction of P(r) that is positive</blockquote>
236</dd></dl>
237
238<dl class="attribute">
239<dt id="sans.pr.invertor.Invertor.get_pr_err">
240<tt class="descname">get_pr_err</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_pr_err" title="Permalink to this definition">¶</a></dt>
241<dd>Function to call to evaluate P(r) with errors
242&#64;param args: c-parameters and r
243&#64;return: (P(r),dP(r))</dd></dl>
244
245<dl class="attribute">
246<dt id="sans.pr.invertor.Invertor.get_qmax">
247<tt class="descname">get_qmax</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_qmax" title="Permalink to this definition">¶</a></dt>
248<dd>Gets the maximum q</dd></dl>
249
250<dl class="attribute">
251<dt id="sans.pr.invertor.Invertor.get_qmin">
252<tt class="descname">get_qmin</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_qmin" title="Permalink to this definition">¶</a></dt>
253<dd>Gets the minimum q</dd></dl>
254
255<dl class="attribute">
256<dt id="sans.pr.invertor.Invertor.get_slit_height">
257<tt class="descname">get_slit_height</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_slit_height" title="Permalink to this definition">¶</a></dt>
258<dd>Gets the slit height</dd></dl>
259
260<dl class="attribute">
261<dt id="sans.pr.invertor.Invertor.get_slit_width">
262<tt class="descname">get_slit_width</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_slit_width" title="Permalink to this definition">¶</a></dt>
263<dd>Gets the slit width</dd></dl>
264
265<dl class="attribute">
266<dt id="sans.pr.invertor.Invertor.get_x">
267<tt class="descname">get_x</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_x" title="Permalink to this definition">¶</a></dt>
268<dd><p>Function to get the x data
269Takes an array of doubles as input.</p>
270<blockquote>
271&#64;return: number of entries found</blockquote>
272</dd></dl>
273
274<dl class="attribute">
275<dt id="sans.pr.invertor.Invertor.get_y">
276<tt class="descname">get_y</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_y" title="Permalink to this definition">¶</a></dt>
277<dd><p>Function to get the y data
278Takes an array of doubles as input.</p>
279<blockquote>
280&#64;return: number of entries found</blockquote>
281</dd></dl>
282
283<dl class="method">
284<dt id="sans.pr.invertor.Invertor.invert">
285<tt class="descname">invert</tt><big>(</big><em>nfunc=10</em>, <em>nr=20</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.invert" title="Permalink to this definition">¶</a></dt>
286<dd><p>Perform inversion to P(r)</p>
287<p>The problem is solved by posing the problem as  Ax = b,
288where x is the set of coefficients we are looking for.</p>
289<p>Npts is the number of points.</p>
290<p>In the following i refers to the ith base function coefficient.
291The matrix has its entries j in its first Npts rows set to</p>
292<blockquote>
293A[i][j] = (Fourier transformed base function for point j)</blockquote>
294<p>We them choose a number of r-points, n_r, to evaluate the second
295derivative of P(r) at. This is used as our regularization term.
296For a vector r of length n_r, the following n_r rows are set to</p>
297<blockquote>
298A[i+Npts][j] = (2nd derivative of P(r), d**2(P(r))/d(r)**2, evaluated at r[j])</blockquote>
299<dl class="docutils">
300<dt>The vector b has its first Npts entries set to</dt>
301<dd>b[j] = (I(q) observed for point j)</dd>
302</dl>
303<p>The following n_r entries are set to zero.</p>
304<p>The result is found by using scipy.linalg.basic.lstsq to invert
305the matrix and find the coefficients x.</p>
306<table class="docutils field-list" frame="void" rules="none">
307<col class="field-name" />
308<col class="field-body" />
309<tbody valign="top">
310<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
311<li><strong>nfunc</strong> &#8211; number of base functions to use.</li>
312<li><strong>nr</strong> &#8211; number of r points to evaluate the 2nd derivative at for the reg. term.</li>
313</ul>
314</td>
315</tr>
316<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">c_out, c_cov - the coefficients with covariance matrix</p>
317</td>
318</tr>
319</tbody>
320</table>
321</dd></dl>
322
323<dl class="method">
324<dt id="sans.pr.invertor.Invertor.invert_optimize">
325<tt class="descname">invert_optimize</tt><big>(</big><em>nfunc=10</em>, <em>nr=20</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.invert_optimize" title="Permalink to this definition">¶</a></dt>
326<dd><p>Slower version of the P(r) inversion that uses scipy.optimize.leastsq.</p>
327<p>This probably produce more reliable results, but is much slower.
328The minimization function is set to sum_i[ (I_obs(q_i) - I_theo(q_i))/err**2 ] + alpha * reg_term,
329where the reg_term is given by Svergun: it is the integral of the square of the first derivative
330of P(r), d(P(r))/dr, integrated over the full range of r.</p>
331<table class="docutils field-list" frame="void" rules="none">
332<col class="field-name" />
333<col class="field-body" />
334<tbody valign="top">
335<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
336<li><strong>nfunc</strong> &#8211; number of base functions to use.</li>
337<li><strong>nr</strong> &#8211; number of r points to evaluate the 2nd derivative at for the reg. term.</li>
338</ul>
339</td>
340</tr>
341<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">c_out, c_cov - the coefficients with covariance matrix</p>
342</td>
343</tr>
344</tbody>
345</table>
346</dd></dl>
347
348<dl class="method">
349<dt id="sans.pr.invertor.Invertor.iq">
350<tt class="descname">iq</tt><big>(</big><em>out</em>, <em>q</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.iq" title="Permalink to this definition">¶</a></dt>
351<dd><p>Function to call to evaluate the scattering intensity</p>
352<table class="docutils field-list" frame="void" rules="none">
353<col class="field-name" />
354<col class="field-body" />
355<tbody valign="top">
356<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
357<li><strong>args</strong> &#8211; c-parameters, and q</li>
358</ul>
359</td>
360</tr>
361<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">I(q)</p>
362</td>
363</tr>
364</tbody>
365</table>
366</dd></dl>
367
368<dl class="attribute">
369<dt id="sans.pr.invertor.Invertor.iq0">
370<tt class="descname">iq0</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.iq0" title="Permalink to this definition">¶</a></dt>
371<dd>Returns the value of I(q=0).
372&#64;param args: c-parameters
373&#64;return: I(q=0)</dd></dl>
374
375<dl class="attribute">
376<dt id="sans.pr.invertor.Invertor.iq_smeared">
377<tt class="descname">iq_smeared</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.iq_smeared" title="Permalink to this definition">¶</a></dt>
378<dd><p>Function to call to evaluate the scattering intensity.
379The scattering intensity is slit-smeared. &#64;param args: c-parameters, and q</p>
380<blockquote>
381&#64;return: I(q)</blockquote>
382</dd></dl>
383
384<dl class="attribute">
385<dt id="sans.pr.invertor.Invertor.is_valid">
386<tt class="descname">is_valid</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.is_valid" title="Permalink to this definition">¶</a></dt>
387<dd>Check the validity of the stored data
388&#64;return: Returns the number of points if it&#8217;s all good, -1 otherwise</dd></dl>
389
390<dl class="method">
391<dt id="sans.pr.invertor.Invertor.lstsq">
392<tt class="descname">lstsq</tt><big>(</big><em>nfunc=5</em>, <em>nr=20</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.lstsq" title="Permalink to this definition">¶</a></dt>
393<dd><p>The problem is solved by posing the problem as  Ax = b,
394where x is the set of coefficients we are looking for.</p>
395<p>Npts is the number of points.</p>
396<p>In the following i refers to the ith base function coefficient.
397The matrix has its entries j in its first Npts rows set to</p>
398<blockquote>
399A[i][j] = (Fourier transformed base function for point j)</blockquote>
400<p>We them choose a number of r-points, n_r, to evaluate the second
401derivative of P(r) at. This is used as our regularization term.
402For a vector r of length n_r, the following n_r rows are set to</p>
403<blockquote>
404A[i+Npts][j] = (2nd derivative of P(r), d**2(P(r))/d(r)**2, evaluated at r[j])</blockquote>
405<dl class="docutils">
406<dt>The vector b has its first Npts entries set to</dt>
407<dd>b[j] = (I(q) observed for point j)</dd>
408</dl>
409<p>The following n_r entries are set to zero.</p>
410<p>The result is found by using scipy.linalg.basic.lstsq to invert
411the matrix and find the coefficients x.</p>
412<table class="docutils field-list" frame="void" rules="none">
413<col class="field-name" />
414<col class="field-body" />
415<tbody valign="top">
416<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
417<li><strong>nfunc</strong> &#8211; number of base functions to use.</li>
418<li><strong>nr</strong> &#8211; number of r points to evaluate the 2nd derivative at for the reg. term.</li>
419</ul>
420</td>
421</tr>
422</tbody>
423</table>
424<p>If the result does not allow us to compute the covariance matrix,
425a matrix filled with zeros will be returned.</p>
426</dd></dl>
427
428<dl class="attribute">
429<dt id="sans.pr.invertor.Invertor.oscillations">
430<tt class="descname">oscillations</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.oscillations" title="Permalink to this definition">¶</a></dt>
431<dd><p>Returns the value of the oscillation figure of merit for
432the given set of coefficients. For a sphere, the oscillation
433figure of merit is 1.1.</p>
434<blockquote>
435&#64;param args: c-parameters
436&#64;return: oscillation figure of merit</blockquote>
437</dd></dl>
438
439<dl class="attribute">
440<dt id="sans.pr.invertor.Invertor.pr">
441<tt class="descname">pr</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.pr" title="Permalink to this definition">¶</a></dt>
442<dd>Function to call to evaluate P(r)
443&#64;param args: c-parameters and r
444&#64;return: P(r)</dd></dl>
445
446<dl class="method">
447<dt id="sans.pr.invertor.Invertor.pr_err">
448<tt class="descname">pr_err</tt><big>(</big><em>c</em>, <em>c_cov</em>, <em>r</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.pr_err" title="Permalink to this definition">¶</a></dt>
449<dd><p>Returns the value of P(r) for a given r, and base function
450coefficients, with error.</p>
451<table class="docutils field-list" frame="void" rules="none">
452<col class="field-name" />
453<col class="field-body" />
454<tbody valign="top">
455<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
456<li><strong>c</strong> &#8211; base function coefficients</li>
457<li><strong>c_cov</strong> &#8211; covariance matrice of the base function coefficients</li>
458<li><strong>r</strong> &#8211; r-value to evaluate P(r) at</li>
459</ul>
460</td>
461</tr>
462<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">P(r)</p>
463</td>
464</tr>
465</tbody>
466</table>
467</dd></dl>
468
469<dl class="method">
470<dt id="sans.pr.invertor.Invertor.pr_fit">
471<tt class="descname">pr_fit</tt><big>(</big><em>nfunc=5</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.pr_fit" title="Permalink to this definition">¶</a></dt>
472<dd><p>This is a direct fit to a given P(r). It assumes that the y data
473is set to some P(r) distribution that we are trying to reproduce
474with a set of base functions.</p>
475<p>This method is provided as a test.</p>
476</dd></dl>
477
478<dl class="attribute">
479<dt id="sans.pr.invertor.Invertor.pr_residuals">
480<tt class="descname">pr_residuals</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.pr_residuals" title="Permalink to this definition">¶</a></dt>
481<dd><p>Function to call to evaluate the residuals
482for P(r) minimization (for testing purposes)</p>
483<blockquote>
484&#64;param args: input parameters
485&#64;return: list of residuals</blockquote>
486</dd></dl>
487
488<dl class="attribute">
489<dt id="sans.pr.invertor.Invertor.residuals">
490<tt class="descname">residuals</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.residuals" title="Permalink to this definition">¶</a></dt>
491<dd><p>Function to call to evaluate the residuals
492for P(r) inversion</p>
493<blockquote>
494&#64;param args: input parameters
495&#64;return: list of residuals</blockquote>
496</dd></dl>
497
498<dl class="attribute">
499<dt id="sans.pr.invertor.Invertor.rg">
500<tt class="descname">rg</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.rg" title="Permalink to this definition">¶</a></dt>
501<dd>Returns the value of the radius of gyration Rg.
502&#64;param args: c-parameters
503&#64;return: Rg</dd></dl>
504
505<dl class="attribute">
506<dt id="sans.pr.invertor.Invertor.set_alpha">
507<tt class="descname">set_alpha</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_alpha" title="Permalink to this definition">¶</a></dt>
508<dd>Sets the alpha parameter</dd></dl>
509
510<dl class="attribute">
511<dt id="sans.pr.invertor.Invertor.set_dmax">
512<tt class="descname">set_dmax</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_dmax" title="Permalink to this definition">¶</a></dt>
513<dd>Sets the maximum distance</dd></dl>
514
515<dl class="attribute">
516<dt id="sans.pr.invertor.Invertor.set_err">
517<tt class="descname">set_err</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_err" title="Permalink to this definition">¶</a></dt>
518<dd><p>Function to set the err data
519Takes an array of doubles as input.</p>
520<blockquote>
521&#64;return: number of entries found</blockquote>
522</dd></dl>
523
524<dl class="attribute">
525<dt id="sans.pr.invertor.Invertor.set_has_bck">
526<tt class="descname">set_has_bck</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_has_bck" title="Permalink to this definition">¶</a></dt>
527<dd>Sets background flag</dd></dl>
528
529<dl class="attribute">
530<dt id="sans.pr.invertor.Invertor.set_qmax">
531<tt class="descname">set_qmax</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_qmax" title="Permalink to this definition">¶</a></dt>
532<dd>Sets the maximum q</dd></dl>
533
534<dl class="attribute">
535<dt id="sans.pr.invertor.Invertor.set_qmin">
536<tt class="descname">set_qmin</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_qmin" title="Permalink to this definition">¶</a></dt>
537<dd>Sets the minimum q</dd></dl>
538
539<dl class="attribute">
540<dt id="sans.pr.invertor.Invertor.set_slit_height">
541<tt class="descname">set_slit_height</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_slit_height" title="Permalink to this definition">¶</a></dt>
542<dd>Sets the slit height in units of q [A-1]</dd></dl>
543
544<dl class="attribute">
545<dt id="sans.pr.invertor.Invertor.set_slit_width">
546<tt class="descname">set_slit_width</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_slit_width" title="Permalink to this definition">¶</a></dt>
547<dd>Sets the slit width in units of q [A-1]</dd></dl>
548
549<dl class="attribute">
550<dt id="sans.pr.invertor.Invertor.set_x">
551<tt class="descname">set_x</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_x" title="Permalink to this definition">¶</a></dt>
552<dd><p>Function to set the x data
553Takes an array of doubles as input.</p>
554<blockquote>
555&#64;return: number of entries found</blockquote>
556</dd></dl>
557
558<dl class="attribute">
559<dt id="sans.pr.invertor.Invertor.set_y">
560<tt class="descname">set_y</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_y" title="Permalink to this definition">¶</a></dt>
561<dd><p>Function to set the y data
562Takes an array of doubles as input.</p>
563<blockquote>
564&#64;return: number of entries found</blockquote>
565</dd></dl>
566
567<dl class="method">
568<dt id="sans.pr.invertor.Invertor.to_file">
569<tt class="descname">to_file</tt><big>(</big><em>path</em>, <em>npts=100</em><big>)</big><a class="headerlink" href="#sans.pr.invertor.Invertor.to_file" title="Permalink to this definition">¶</a></dt>
570<dd><p>Save the state to a file that will be readable
571by SliceView.</p>
572<table class="docutils field-list" frame="void" rules="none">
573<col class="field-name" />
574<col class="field-body" />
575<tbody valign="top">
576<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
577<li><strong>path</strong> &#8211; path of the file to write</li>
578<li><strong>npts</strong> &#8211; number of P(r) points to be written</li>
579</ul>
580</td>
581</tr>
582</tbody>
583</table>
584</dd></dl>
585
586</dd></dl>
587
588<dl class="function">
589<dt id="sans.pr.invertor.help">
590<tt class="descclassname">sans.pr.invertor.</tt><tt class="descname">help</tt><big>(</big><big>)</big><a class="headerlink" href="#sans.pr.invertor.help" title="Permalink to this definition">¶</a></dt>
591<dd>Provide general online help text
592Future work: extend this function to allow topic selection</dd></dl>
593
594</div>
595</div>
596
597
598          </div>
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604  <ul>
605<li><a class="reference internal" href="#">invertor</a><ul>
606<li><a class="reference internal" href="#module-sans.pr.invertor"><tt class="docutils literal"><span class="pre">sans.pr.invertor</span></tt></a></li>
607</ul>
608</li>
609</ul>
610
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