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<h4 class="subsectionHead"><span class="titlemark"><span
class="cmr-12">5.4 </span></span> <a
id="x19-180005.4"></a><span
class="cmr-12">Method smoothers</span><span
class="cmr-12">_build</span></h4>
<div class="center"
>
<!--l. 625--><p class="noindent" >
<!--l. 626--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">call</span><span
class="cmtt-12"> </span><span
class="cmtt-12">p</span><span
class="cmtt-12">%</span><span
class="cmtt-12">smoothers_build</span><span
class="cmtt-12">(</span><span
class="cmtt-12">a</span><span
class="cmtt-12">,</span><span
class="cmtt-12">desc_a</span><span
class="cmtt-12">,</span><span
class="cmtt-12">p</span><span
class="cmtt-12">,</span><span
class="cmtt-12">info</span><span
class="cmtt-12">[,</span><span
class="cmtt-12">amold</span><span
class="cmtt-12">,</span><span
class="cmtt-12">vmold</span><span
class="cmtt-12">,</span><span
class="cmtt-12">imold</span><span
class="cmtt-12">])</span><br />
</div>
<!--l. 629--><p class="noindent" ><span
class="cmr-12">This method builds the smoothers and the coarsest-level solvers for the multilevel</span>
<span
class="cmr-12">preconditioner </span><span class="lstinline"></span><span
class="cmtt-12">p</span><span
class="cmr-12">, according to the requirements made by the user through the methods</span>
<span class="lstinline"></span><span
class="cmtt-12">init</span> <span
class="cmr-12">and </span><span class="lstinline"></span><span
class="cmtt-12">set</span><span
class="cmr-12">, and based on the aggregation hierarchy produced by a previous call to</span>
<span class="lstinline"></span><span
class="cmtt-12">hierarchy_build</span> <span
class="cmr-12">(see Section</span><span
class="cmr-12"> </span><a
href="userhtmlsu9.html#x18-170005.3"><span
class="cmr-12">5.3</span><!--tex4ht:ref: sec:hier_bld --></a><span
class="cmr-12">).</span>
<!--l. 636--><p class="noindent" ><span
class="cmbx-12">Arguments</span>
<div class="tabular"> <table id="TBL-11" class="tabular"
cellspacing="0" cellpadding="0"
><colgroup id="TBL-11-1g"><col
id="TBL-11-1"><col
id="TBL-11-2"></colgroup><tr
style="vertical-align:baseline;" id="TBL-11-1-"><td style="white-space:normal; text-align:left;" id="TBL-11-1-1"
class="td11"><!--l. 639--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">a</span> </td><td style="white-space:normal; text-align:left;" id="TBL-11-1-2"
class="td11"><!--l. 639--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">type</span><span
class="cmtt-12">(</span><span
class="cmtt-12">psb_</span><span
class="cmti-12">x</span><span class="lstinline"></span><span
class="cmtt-12">spmat_type</span><span
class="cmtt-12">),</span><span
class="cmtt-12"> </span><span
class="cmtt-12">intent</span><span
class="cmtt-12">(</span><span
class="cmtt-12">in</span><span
class="cmtt-12">)</span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-2-"><td style="white-space:normal; text-align:left;" id="TBL-11-2-1"
class="td11"><!--l. 640--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-11-2-2"
class="td11"><!--l. 640--><p class="noindent" ><span
class="cmr-12">The sparse matrix structure containing the local part of the matrix</span>
<span
class="cmr-12">to be preconditioned. Note that </span><span
class="cmti-12">x </span><span
class="cmr-12">must be chosen according to the</span>
<span class="lstinline"></span><span
class="cmtt-12">real</span><span
class="cmr-12">/</span><span class="lstinline"></span><span
class="cmtt-12">complex</span><span
class="cmr-12">, single/double precision version of AMG4PSBLAS</span>
<span
class="cmr-12">under use. See the PSBLAS User’s Guide for details </span><span class="cite"><span
class="cmr-12">[</span><a
href="userhtmlli4.html#XPSBLASGUIDE"><span
class="cmr-12">17</span></a><span
class="cmr-12">]</span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-3-"><td style="white-space:normal; text-align:left;" id="TBL-11-3-1"
class="td11"><!--l. 644--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">desc_a</span></td><td style="white-space:normal; text-align:left;" id="TBL-11-3-2"
class="td11"><!--l. 644--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">type</span><span
class="cmtt-12">(</span><span
class="cmtt-12">psb_desc_type</span><span
class="cmtt-12">),</span><span
class="cmtt-12"> </span><span
class="cmtt-12">intent</span><span
class="cmtt-12">(</span><span
class="cmtt-12">in</span><span
class="cmtt-12">)</span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-4-"><td style="white-space:normal; text-align:left;" id="TBL-11-4-1"
class="td11"><!--l. 645--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-11-4-2"
class="td11"><!--l. 645--><p class="noindent" ><span
class="cmr-12">The communication descriptor of </span><span class="lstinline"></span><span
class="cmtt-12">a</span><span
class="cmr-12">. See the PSBLAS User’s Guide</span>
<span
class="cmr-12">for details </span><span class="cite"><span
class="cmr-12">[</span><a
href="userhtmlli4.html#XPSBLASGUIDE"><span
class="cmr-12">17</span></a><span
class="cmr-12">]</span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-5-"><td style="white-space:normal; text-align:left;" id="TBL-11-5-1"
class="td11"><!--l. 647--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">info</span> </td><td style="white-space:normal; text-align:left;" id="TBL-11-5-2"
class="td11"><!--l. 647--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">integer</span><span
class="cmtt-12">,</span><span
class="cmtt-12"> </span><span
class="cmtt-12">intent</span><span
class="cmtt-12">(</span><span
class="cmtt-12">out</span><span
class="cmtt-12">)</span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-6-"><td style="white-space:normal; text-align:left;" id="TBL-11-6-1"
class="td11"><!--l. 648--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-11-6-2"
class="td11"><!--l. 648--><p class="noindent" ><span
class="cmr-12">Error code. If no error, 0 is returned. See Section</span><span
class="cmr-12"> </span><a
href="userhtmlse7.html#x26-300007"><span
class="cmr-12">7</span><!--tex4ht:ref: sec:errors --></a> <span
class="cmr-12">for details.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-7-"><td style="white-space:normal; text-align:left;" id="TBL-11-7-1"
class="td11"><!--l. 649--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">amold</span> </td><td style="white-space:normal; text-align:left;" id="TBL-11-7-2"
class="td11"><!--l. 649--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">class</span><span
class="cmtt-12">(</span><span
class="cmtt-12">psb_</span><span
class="cmti-12">x</span><span class="lstinline"></span><span
class="cmtt-12">_base_sparse_mat</span><span
class="cmtt-12">),</span><span
class="cmtt-12"> </span><span
class="cmtt-12">intent</span><span
class="cmtt-12">(</span><span
class="cmtt-12">in</span><span
class="cmtt-12">),</span><span
class="cmtt-12"> </span><span
class="cmtt-12">optional</span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-8-"><td style="white-space:normal; text-align:left;" id="TBL-11-8-1"
class="td11"><!--l. 650--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-11-8-2"
class="td11"><!--l. 650--><p class="noindent" ><span
class="cmr-12">The desired dynamic type for internal matrix components; this</span>
<span
class="cmr-12">allows e.g. running on GPUs; it needs not be the same on all</span>
<span
class="cmr-12">processes. See the PSBLAS User’s Guide for details </span><span class="cite"><span
class="cmr-12">[</span><a
href="userhtmlli4.html#XPSBLASGUIDE"><span
class="cmr-12">17</span></a><span
class="cmr-12">]</span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-9-"><td style="white-space:normal; text-align:left;" id="TBL-11-9-1"
class="td11"><!--l. 654--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">vmold</span> </td><td style="white-space:normal; text-align:left;" id="TBL-11-9-2"
class="td11"><!--l. 654--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">class</span><span
class="cmtt-12">(</span><span
class="cmtt-12">psb_</span><span
class="cmti-12">x</span><span class="lstinline"></span><span
class="cmtt-12">_base_vect_type</span><span
class="cmtt-12">),</span><span
class="cmtt-12"> </span><span
class="cmtt-12">intent</span><span
class="cmtt-12">(</span><span
class="cmtt-12">in</span><span
class="cmtt-12">),</span><span
class="cmtt-12"> </span><span
class="cmtt-12">optional</span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-10-"><td style="white-space:normal; text-align:left;" id="TBL-11-10-1"
class="td11"><!--l. 655--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-11-10-2"
class="td11"><!--l. 655--><p class="noindent" ><span
class="cmr-12">The desired dynamic type for internal vector components; this</span>
<span
class="cmr-12">allows e.g. running on GPUs.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-11-"><td style="white-space:normal; text-align:left;" id="TBL-11-11-1"
class="td11"><!--l. 657--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">imold</span> </td><td style="white-space:normal; text-align:left;" id="TBL-11-11-2"
class="td11"><!--l. 657--><p class="noindent" ><span class="lstinline"></span><span
class="cmtt-12">class</span><span
class="cmtt-12">(</span><span
class="cmtt-12">psb_i_base_vect_type</span><span
class="cmtt-12">),</span><span
class="cmtt-12"> </span><span
class="cmtt-12">intent</span><span
class="cmtt-12">(</span><span
class="cmtt-12">in</span><span
class="cmtt-12">),</span><span
class="cmtt-12"> </span><span
class="cmtt-12">optional</span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-12-"><td style="white-space:normal; text-align:left;" id="TBL-11-12-1"
class="td11"><!--l. 658--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-11-12-2"
class="td11"><!--l. 658--><p class="noindent" ><span
class="cmr-12">The desired dynamic type for internal integer vector components;</span>
<span
class="cmr-12">this allows e.g. running on GPUs.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-13-"><td style="white-space:normal; text-align:left;" id="TBL-11-13-1"
class="td11"> </td> </tr></table></div>
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