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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" title="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>
73<div>A[j][i] = (Fourier transformed base function for point j)</div></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>
78<div>A[j+Npts][i] = (2nd derivative of P(r), d**2(P(r))/d(r)**2,
79evaluated at r[j])</div></blockquote>
80<dl class="docutils">
81<dt>The vector b has its first Npts entries set to</dt>
82<dd>b[j] = (I(q) observed for point j)</dd>
83</dl>
84<p>The following n_r entries are set to zero.</p>
85<p>The result is found by using scipy.linalg.basic.lstsq to invert
86the matrix and find the coefficients x.</p>
87<p>Methods inherited from Cinvertor:
88- get_peaks(pars): returns the number of P(r) peaks
89- oscillations(pars): returns the oscillation parameters for the output P(r)
90- get_positive(pars): returns the fraction of P(r) that is above zero
91- get_pos_err(pars): returns the fraction of P(r) that is 1-sigma above zero</p>
92<dl class="attribute">
93<dt id="sans.pr.invertor.Invertor.basefunc_ft">
94<tt class="descname">basefunc_ft</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.basefunc_ft" title="Permalink to this definition">¶</a></dt>
95<dd><p>Returns the value of the nth Fourier transofrmed base function
96&#64;param args: c-parameters, n and q
97&#64;return: nth Fourier transformed base function, evaluated at q</p>
98</dd></dl>
99
100<dl class="method">
101<dt id="sans.pr.invertor.Invertor.clone">
102<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>
103<dd><p>Return a clone of this instance</p>
104</dd></dl>
105
106<dl class="method">
107<dt id="sans.pr.invertor.Invertor.estimate_alpha">
108<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>
109<dd><p>Returns a reasonable guess for the
110regularization constant alpha</p>
111<table class="docutils field-list" frame="void" rules="none">
112<col class="field-name" />
113<col class="field-body" />
114<tbody valign="top">
115<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>nfunc</strong> &#8211; number of terms to use in the expansion.</td>
116</tr>
117<tr class="field"><th class="field-name">Returns:</th><td class="field-body">alpha, message, elapsed</td>
118</tr>
119</tbody>
120</table>
121<p>where alpha is the estimate for alpha,
122message is a message for the user,
123elapsed is the computation time</p>
124</dd></dl>
125
126<dl class="method">
127<dt id="sans.pr.invertor.Invertor.estimate_numterms">
128<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>
129<dd><p>Returns a reasonable guess for the
130number of terms</p>
131<table class="docutils field-list" frame="void" rules="none">
132<col class="field-name" />
133<col class="field-body" />
134<tbody valign="top">
135<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>isquit_func</strong> &#8211; reference to thread function to call to
136check whether the computation needs to
137be stopped.</td>
138</tr>
139<tr class="field"><th class="field-name">Returns:</th><td class="field-body">number of terms, alpha, message</td>
140</tr>
141</tbody>
142</table>
143</dd></dl>
144
145<dl class="method">
146<dt id="sans.pr.invertor.Invertor.from_file">
147<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>
148<dd><p>Load the state of the Invertor from a file,
149to be able to generate P(r) from a set of
150parameters.</p>
151<table class="docutils field-list" frame="void" rules="none">
152<col class="field-name" />
153<col class="field-body" />
154<tbody valign="top">
155<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>path</strong> &#8211; path of the file to load</td>
156</tr>
157</tbody>
158</table>
159</dd></dl>
160
161<dl class="attribute">
162<dt id="sans.pr.invertor.Invertor.get_alpha">
163<tt class="descname">get_alpha</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_alpha" title="Permalink to this definition">¶</a></dt>
164<dd><p>Gets the alpha parameter</p>
165</dd></dl>
166
167<dl class="attribute">
168<dt id="sans.pr.invertor.Invertor.get_dmax">
169<tt class="descname">get_dmax</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_dmax" title="Permalink to this definition">¶</a></dt>
170<dd><p>Gets the maximum distance</p>
171</dd></dl>
172
173<dl class="attribute">
174<dt id="sans.pr.invertor.Invertor.get_err">
175<tt class="descname">get_err</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_err" title="Permalink to this definition">¶</a></dt>
176<dd><p>Function to get the err data
177Takes an array of doubles as input.</p>
178<blockquote>
179<div>&#64;return: number of entries found</div></blockquote>
180</dd></dl>
181
182<dl class="attribute">
183<dt id="sans.pr.invertor.Invertor.get_has_bck">
184<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>
185<dd><p>Gets background flag</p>
186</dd></dl>
187
188<dl class="attribute">
189<dt id="sans.pr.invertor.Invertor.get_nerr">
190<tt class="descname">get_nerr</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_nerr" title="Permalink to this definition">¶</a></dt>
191<dd><p>Gets the number of err points</p>
192</dd></dl>
193
194<dl class="attribute">
195<dt id="sans.pr.invertor.Invertor.get_nx">
196<tt class="descname">get_nx</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_nx" title="Permalink to this definition">¶</a></dt>
197<dd><p>Gets the number of x points</p>
198</dd></dl>
199
200<dl class="attribute">
201<dt id="sans.pr.invertor.Invertor.get_ny">
202<tt class="descname">get_ny</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_ny" title="Permalink to this definition">¶</a></dt>
203<dd><p>Gets the number of y points</p>
204</dd></dl>
205
206<dl class="attribute">
207<dt id="sans.pr.invertor.Invertor.get_peaks">
208<tt class="descname">get_peaks</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_peaks" title="Permalink to this definition">¶</a></dt>
209<dd><p>Returns the number of peaks in the output P(r) distrubution
210for the given set of coefficients.</p>
211<blockquote>
212<div>&#64;param args: c-parameters
213&#64;return: number of P(r) peaks</div></blockquote>
214</dd></dl>
215
216<dl class="attribute">
217<dt id="sans.pr.invertor.Invertor.get_pos_err">
218<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>
219<dd><p>Returns the fraction of P(r) that is 1 standard deviation
220above zero over the full range of r for the given set of coefficients.</p>
221<blockquote>
222<div>&#64;param args: c-parameters
223&#64;return: fraction of P(r) that is positive</div></blockquote>
224</dd></dl>
225
226<dl class="attribute">
227<dt id="sans.pr.invertor.Invertor.get_positive">
228<tt class="descname">get_positive</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_positive" title="Permalink to this definition">¶</a></dt>
229<dd><p>Returns the fraction of P(r) that is positive over
230the full range of r for the given set of coefficients.</p>
231<blockquote>
232<div>&#64;param args: c-parameters
233&#64;return: fraction of P(r) that is positive</div></blockquote>
234</dd></dl>
235
236<dl class="attribute">
237<dt id="sans.pr.invertor.Invertor.get_pr_err">
238<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>
239<dd><p>Function to call to evaluate P(r) with errors
240&#64;param args: c-parameters and r
241&#64;return: (P(r),dP(r))</p>
242</dd></dl>
243
244<dl class="attribute">
245<dt id="sans.pr.invertor.Invertor.get_qmax">
246<tt class="descname">get_qmax</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_qmax" title="Permalink to this definition">¶</a></dt>
247<dd><p>Gets the maximum q</p>
248</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><p>Gets the minimum q</p>
254</dd></dl>
255
256<dl class="attribute">
257<dt id="sans.pr.invertor.Invertor.get_slit_height">
258<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>
259<dd><p>Gets the slit height</p>
260</dd></dl>
261
262<dl class="attribute">
263<dt id="sans.pr.invertor.Invertor.get_slit_width">
264<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>
265<dd><p>Gets the slit width</p>
266</dd></dl>
267
268<dl class="attribute">
269<dt id="sans.pr.invertor.Invertor.get_x">
270<tt class="descname">get_x</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_x" title="Permalink to this definition">¶</a></dt>
271<dd><p>Function to get the x data
272Takes an array of doubles as input.</p>
273<blockquote>
274<div>&#64;return: number of entries found</div></blockquote>
275</dd></dl>
276
277<dl class="attribute">
278<dt id="sans.pr.invertor.Invertor.get_y">
279<tt class="descname">get_y</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.get_y" title="Permalink to this definition">¶</a></dt>
280<dd><p>Function to get the y data
281Takes an array of doubles as input.</p>
282<blockquote>
283<div>&#64;return: number of entries found</div></blockquote>
284</dd></dl>
285
286<dl class="method">
287<dt id="sans.pr.invertor.Invertor.invert">
288<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>
289<dd><p>Perform inversion to P(r)</p>
290<p>The problem is solved by posing the problem as  Ax = b,
291where x is the set of coefficients we are looking for.</p>
292<p>Npts is the number of points.</p>
293<p>In the following i refers to the ith base function coefficient.
294The matrix has its entries j in its first Npts rows set to</p>
295<blockquote>
296<div>A[i][j] = (Fourier transformed base function for point j)</div></blockquote>
297<p>We them choose a number of r-points, n_r, to evaluate the second
298derivative of P(r) at. This is used as our regularization term.
299For a vector r of length n_r, the following n_r rows are set to</p>
300<blockquote>
301<div>A[i+Npts][j] = (2nd derivative of P(r), d**2(P(r))/d(r)**2, evaluated at r[j])</div></blockquote>
302<dl class="docutils">
303<dt>The vector b has its first Npts entries set to</dt>
304<dd>b[j] = (I(q) observed for point j)</dd>
305</dl>
306<p>The following n_r entries are set to zero.</p>
307<p>The result is found by using scipy.linalg.basic.lstsq to invert
308the matrix and find the coefficients x.</p>
309<table class="docutils field-list" frame="void" rules="none">
310<col class="field-name" />
311<col class="field-body" />
312<tbody valign="top">
313<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
314<li><strong>nfunc</strong> &#8211; number of base functions to use.</li>
315<li><strong>nr</strong> &#8211; number of r points to evaluate the 2nd derivative at for the reg. term.</li>
316</ul>
317</td>
318</tr>
319<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>
320</td>
321</tr>
322</tbody>
323</table>
324</dd></dl>
325
326<dl class="method">
327<dt id="sans.pr.invertor.Invertor.invert_optimize">
328<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>
329<dd><p>Slower version of the P(r) inversion that uses scipy.optimize.leastsq.</p>
330<p>This probably produce more reliable results, but is much slower.
331The minimization function is set to
332sum_i[ (I_obs(q_i) - I_theo(q_i))/err**2 ] + alpha * reg_term,
333where the reg_term is given by Svergun: it is the integral of
334the square of the first derivative
335of P(r), d(P(r))/dr, integrated over the full range of r.</p>
336<table class="docutils field-list" frame="void" rules="none">
337<col class="field-name" />
338<col class="field-body" />
339<tbody valign="top">
340<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
341<li><strong>nfunc</strong> &#8211; number of base functions to use.</li>
342<li><strong>nr</strong> &#8211; number of r points to evaluate the 2nd derivative at
343for the reg. term.</li>
344</ul>
345</td>
346</tr>
347<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>
348</td>
349</tr>
350</tbody>
351</table>
352</dd></dl>
353
354<dl class="method">
355<dt id="sans.pr.invertor.Invertor.iq">
356<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>
357<dd><p>Function to call to evaluate the scattering intensity</p>
358<table class="docutils field-list" frame="void" rules="none">
359<col class="field-name" />
360<col class="field-body" />
361<tbody valign="top">
362<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><strong>args</strong> &#8211; c-parameters, and q</td>
363</tr>
364<tr class="field"><th class="field-name">Returns:</th><td class="field-body">I(q)</td>
365</tr>
366</tbody>
367</table>
368</dd></dl>
369
370<dl class="attribute">
371<dt id="sans.pr.invertor.Invertor.iq0">
372<tt class="descname">iq0</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.iq0" title="Permalink to this definition">¶</a></dt>
373<dd><p>Returns the value of I(q=0).
374&#64;param args: c-parameters
375&#64;return: I(q=0)</p>
376</dd></dl>
377
378<dl class="attribute">
379<dt id="sans.pr.invertor.Invertor.iq_smeared">
380<tt class="descname">iq_smeared</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.iq_smeared" title="Permalink to this definition">¶</a></dt>
381<dd><p>Function to call to evaluate the scattering intensity.
382The scattering intensity is slit-smeared. &#64;param args: c-parameters, and q</p>
383<blockquote>
384<div>&#64;return: I(q)</div></blockquote>
385</dd></dl>
386
387<dl class="attribute">
388<dt id="sans.pr.invertor.Invertor.is_valid">
389<tt class="descname">is_valid</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.is_valid" title="Permalink to this definition">¶</a></dt>
390<dd><p>Check the validity of the stored data
391&#64;return: Returns the number of points if it&#8217;s all good, -1 otherwise</p>
392</dd></dl>
393
394<dl class="method">
395<dt id="sans.pr.invertor.Invertor.lstsq">
396<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>
397<dd><p>The problem is solved by posing the problem as  Ax = b,
398where x is the set of coefficients we are looking for.</p>
399<p>Npts is the number of points.</p>
400<p>In the following i refers to the ith base function coefficient.
401The matrix has its entries j in its first Npts rows set to</p>
402<blockquote>
403<div>A[i][j] = (Fourier transformed base function for point j)</div></blockquote>
404<p>We them choose a number of r-points, n_r, to evaluate the second
405derivative of P(r) at. This is used as our regularization term.
406For a vector r of length n_r, the following n_r rows are set to</p>
407<blockquote>
408<div>A[i+Npts][j] = (2nd derivative of P(r), d**2(P(r))/d(r)**2,
409evaluated at r[j])</div></blockquote>
410<dl class="docutils">
411<dt>The vector b has its first Npts entries set to</dt>
412<dd>b[j] = (I(q) observed for point j)</dd>
413</dl>
414<p>The following n_r entries are set to zero.</p>
415<p>The result is found by using scipy.linalg.basic.lstsq to invert
416the matrix and find the coefficients x.</p>
417<table class="docutils field-list" frame="void" rules="none">
418<col class="field-name" />
419<col class="field-body" />
420<tbody valign="top">
421<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
422<li><strong>nfunc</strong> &#8211; number of base functions to use.</li>
423<li><strong>nr</strong> &#8211; number of r points to evaluate the 2nd derivative at
424for the reg. term.</li>
425</ul>
426</td>
427</tr>
428</tbody>
429</table>
430<p>If the result does not allow us to compute the covariance matrix,
431a matrix filled with zeros will be returned.</p>
432</dd></dl>
433
434<dl class="attribute">
435<dt id="sans.pr.invertor.Invertor.oscillations">
436<tt class="descname">oscillations</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.oscillations" title="Permalink to this definition">¶</a></dt>
437<dd><p>Returns the value of the oscillation figure of merit for
438the given set of coefficients. For a sphere, the oscillation
439figure of merit is 1.1.</p>
440<blockquote>
441<div>&#64;param args: c-parameters
442&#64;return: oscillation figure of merit</div></blockquote>
443</dd></dl>
444
445<dl class="attribute">
446<dt id="sans.pr.invertor.Invertor.pr">
447<tt class="descname">pr</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.pr" title="Permalink to this definition">¶</a></dt>
448<dd><p>Function to call to evaluate P(r)
449&#64;param args: c-parameters and r
450&#64;return: P(r)</p>
451</dd></dl>
452
453<dl class="method">
454<dt id="sans.pr.invertor.Invertor.pr_err">
455<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>
456<dd><p>Returns the value of P(r) for a given r, and base function
457coefficients, with error.</p>
458<table class="docutils field-list" frame="void" rules="none">
459<col class="field-name" />
460<col class="field-body" />
461<tbody valign="top">
462<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
463<li><strong>c</strong> &#8211; base function coefficients</li>
464<li><strong>c_cov</strong> &#8211; covariance matrice of the base function coefficients</li>
465<li><strong>r</strong> &#8211; r-value to evaluate P(r) at</li>
466</ul>
467</td>
468</tr>
469<tr class="field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">P(r)</p>
470</td>
471</tr>
472</tbody>
473</table>
474</dd></dl>
475
476<dl class="method">
477<dt id="sans.pr.invertor.Invertor.pr_fit">
478<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>
479<dd><p>This is a direct fit to a given P(r). It assumes that the y data
480is set to some P(r) distribution that we are trying to reproduce
481with a set of base functions.</p>
482<p>This method is provided as a test.</p>
483</dd></dl>
484
485<dl class="attribute">
486<dt id="sans.pr.invertor.Invertor.pr_residuals">
487<tt class="descname">pr_residuals</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.pr_residuals" title="Permalink to this definition">¶</a></dt>
488<dd><p>Function to call to evaluate the residuals
489for P(r) minimization (for testing purposes)</p>
490<blockquote>
491<div>&#64;param args: input parameters
492&#64;return: list of residuals</div></blockquote>
493</dd></dl>
494
495<dl class="attribute">
496<dt id="sans.pr.invertor.Invertor.residuals">
497<tt class="descname">residuals</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.residuals" title="Permalink to this definition">¶</a></dt>
498<dd><p>Function to call to evaluate the residuals
499for P(r) inversion</p>
500<blockquote>
501<div>&#64;param args: input parameters
502&#64;return: list of residuals</div></blockquote>
503</dd></dl>
504
505<dl class="attribute">
506<dt id="sans.pr.invertor.Invertor.rg">
507<tt class="descname">rg</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.rg" title="Permalink to this definition">¶</a></dt>
508<dd><p>Returns the value of the radius of gyration Rg.
509&#64;param args: c-parameters
510&#64;return: Rg</p>
511</dd></dl>
512
513<dl class="attribute">
514<dt id="sans.pr.invertor.Invertor.set_alpha">
515<tt class="descname">set_alpha</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_alpha" title="Permalink to this definition">¶</a></dt>
516<dd><p>Sets the alpha parameter</p>
517</dd></dl>
518
519<dl class="attribute">
520<dt id="sans.pr.invertor.Invertor.set_dmax">
521<tt class="descname">set_dmax</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_dmax" title="Permalink to this definition">¶</a></dt>
522<dd><p>Sets the maximum distance</p>
523</dd></dl>
524
525<dl class="attribute">
526<dt id="sans.pr.invertor.Invertor.set_err">
527<tt class="descname">set_err</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_err" title="Permalink to this definition">¶</a></dt>
528<dd><p>Function to set the err data
529Takes an array of doubles as input.</p>
530<blockquote>
531<div>&#64;return: number of entries found</div></blockquote>
532</dd></dl>
533
534<dl class="attribute">
535<dt id="sans.pr.invertor.Invertor.set_has_bck">
536<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>
537<dd><p>Sets background flag</p>
538</dd></dl>
539
540<dl class="attribute">
541<dt id="sans.pr.invertor.Invertor.set_qmax">
542<tt class="descname">set_qmax</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_qmax" title="Permalink to this definition">¶</a></dt>
543<dd><p>Sets the maximum q</p>
544</dd></dl>
545
546<dl class="attribute">
547<dt id="sans.pr.invertor.Invertor.set_qmin">
548<tt class="descname">set_qmin</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_qmin" title="Permalink to this definition">¶</a></dt>
549<dd><p>Sets the minimum q</p>
550</dd></dl>
551
552<dl class="attribute">
553<dt id="sans.pr.invertor.Invertor.set_slit_height">
554<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>
555<dd><p>Sets the slit height in units of q [A-1]</p>
556</dd></dl>
557
558<dl class="attribute">
559<dt id="sans.pr.invertor.Invertor.set_slit_width">
560<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>
561<dd><p>Sets the slit width in units of q [A-1]</p>
562</dd></dl>
563
564<dl class="attribute">
565<dt id="sans.pr.invertor.Invertor.set_x">
566<tt class="descname">set_x</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_x" title="Permalink to this definition">¶</a></dt>
567<dd><p>Function to set the x data
568Takes an array of doubles as input.</p>
569<blockquote>
570<div>&#64;return: number of entries found</div></blockquote>
571</dd></dl>
572
573<dl class="attribute">
574<dt id="sans.pr.invertor.Invertor.set_y">
575<tt class="descname">set_y</tt><a class="headerlink" href="#sans.pr.invertor.Invertor.set_y" title="Permalink to this definition">¶</a></dt>
576<dd><p>Function to set the y data
577Takes an array of doubles as input.</p>
578<blockquote>
579<div>&#64;return: number of entries found</div></blockquote>
580</dd></dl>
581
582<dl class="method">
583<dt id="sans.pr.invertor.Invertor.to_file">
584<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>
585<dd><p>Save the state to a file that will be readable
586by SliceView.</p>
587<table class="docutils field-list" frame="void" rules="none">
588<col class="field-name" />
589<col class="field-body" />
590<tbody valign="top">
591<tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
592<li><strong>path</strong> &#8211; path of the file to write</li>
593<li><strong>npts</strong> &#8211; number of P(r) points to be written</li>
594</ul>
595</td>
596</tr>
597</tbody>
598</table>
599</dd></dl>
600
601</dd></dl>
602
603<dl class="function">
604<dt id="sans.pr.invertor.help">
605<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>
606<dd><p>Provide general online help text
607Future work: extend this function to allow topic selection</p>
608</dd></dl>
609
610</div>
611</div>
612
613
614          </div>
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620  <ul>
621<li><a class="reference internal" href="#">invertor</a><ul>
622<li><a class="reference internal" href="#module-sans.pr.invertor"><tt class="docutils literal"><span class="pre">sans.pr.invertor</span></tt></a></li>
623</ul>
624</li>
625</ul>
626
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