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<head><title>Method smoothers_uild</title>
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<h4 class="subsectionHead"><span class="titlemark"><span
class="cmr-12">5.4 </span></span> <a
id="x21-200005.4"></a><span
class="cmr-12">Method smoothers</span><span
class="cmr-12">_build</span></h4>
<div class="center"
>
<!--l. 750--><p class="noindent" >
<!--l. 751--><p class="noindent" ><code class="lstinline"><span style="color:#000000">call</span><span style="color:#000000"> </span><span style="color:#000000">p</span><span style="color:#000000">%</span><span style="color:#000000">smoothers_build</span><span style="color:#000000">(</span><span style="color:#000000">a</span><span style="color:#000000">,</span><span style="color:#000000">desc_a</span><span style="color:#000000">,</span><span style="color:#000000">p</span><span style="color:#000000">,</span><span style="color:#000000">info</span><span style="color:#000000">[,</span><span style="color:#000000">amold</span><span style="color:#000000">,</span><span style="color:#000000">vmold</span><span style="color:#000000">,</span><span style="color:#000000">imold</span><span style="color:#000000">])</span></code><br />
</div>
<!--l. 754--><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><code class="lstinline"><span style="color:#000000">p</span></code><span
class="cmr-12">, according to the requirements made by the user through the methods</span>
<code class="lstinline"><span style="color:#000000">init</span></code> <span
class="cmr-12">and </span><code class="lstinline"><span style="color:#000000">set</span></code><span
class="cmr-12">, and based on the aggregation hierarchy produced by a previous call to</span>
<code class="lstinline"><span style="color:#000000">hierarchy_build</span></code> <span
class="cmr-12">(see Section</span><span
class="cmr-12">&#x00A0;</span><a
href="userhtmlsu10.html#x20-190005.3"><span
class="cmr-12">5.3</span><!--tex4ht:ref: sec:hier_bld --></a><span
class="cmr-12">).</span>
<!--l. 761--><p class="noindent" ><span
class="cmbx-12">Arguments</span>
<div class="tabular"> <table id="TBL-13" class="tabular"
><colgroup id="TBL-13-1g"><col
id="TBL-13-1"><col
id="TBL-13-2"></colgroup><tr
style="vertical-align:baseline;" id="TBL-13-1-"><td style="white-space:normal; text-align:left;" id="TBL-13-1-1"
class="td11"> <!--l. 764--><p class="noindent" ><code class="lstinline"><span style="color:#000000">a</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-13-1-2"
class="td11"> <!--l. 764--><p class="noindent" ><code class="lstinline"><span style="color:#000000">type</span><span style="color:#000000">(</span><span style="color:#000000">psb_</span></code><span
class="cmti-12">x</span><code class="lstinline"><span style="color:#000000">spmat_type</span><span style="color:#000000">),</span><span style="color:#000000"> </span><span style="color:#000000">intent</span><span style="color:#000000">(</span><span style="color:#000000">in</span><span style="color:#000000">)</span></code><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-2-"><td style="white-space:normal; text-align:left;" id="TBL-13-2-1"
class="td11"> <!--l. 765--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-13-2-2"
class="td11"> <!--l. 765--><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>
<code class="lstinline"><span style="color:#000000">real</span></code><span
class="cmr-12">/</span><code class="lstinline"><span style="color:#000000">complex</span></code><span
class="cmr-12">, single/double precision version of AMG4PSBLAS</span>
<span
class="cmr-12">under use. See the PSBLAS User&#8217;s Guide for details </span><span class="cite"><span
class="cmr-12">[</span><a
href="userhtmlli5.html#XPSBLASGUIDE"><span
class="cmr-12">21</span></a><span
class="cmr-12">]</span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-3-"><td style="white-space:normal; text-align:left;" id="TBL-13-3-1"
class="td11"> <!--l. 769--><p class="noindent" ><code class="lstinline"><span style="color:#000000">desc_a</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-13-3-2"
class="td11"> <!--l. 769--><p class="noindent" ><code class="lstinline"><span style="color:#000000">type</span><span style="color:#000000">(</span><span style="color:#000000">psb_desc_type</span><span style="color:#000000">),</span><span style="color:#000000"> </span><span style="color:#000000">intent</span><span style="color:#000000">(</span><span style="color:#000000">in</span><span style="color:#000000">)</span></code><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-4-"><td style="white-space:normal; text-align:left;" id="TBL-13-4-1"
class="td11"> <!--l. 770--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-13-4-2"
class="td11"> <!--l. 770--><p class="noindent" ><span
class="cmr-12">The communication descriptor of </span><code class="lstinline"><span style="color:#000000">a</span></code><span
class="cmr-12">. See the PSBLAS User&#8217;s Guide</span>
<span
class="cmr-12">for details </span><span class="cite"><span
class="cmr-12">[</span><a
href="userhtmlli5.html#XPSBLASGUIDE"><span
class="cmr-12">21</span></a><span
class="cmr-12">]</span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-5-"><td style="white-space:normal; text-align:left;" id="TBL-13-5-1"
class="td11"> <!--l. 772--><p class="noindent" ><code class="lstinline"><span style="color:#000000">info</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-13-5-2"
class="td11"> <!--l. 772--><p class="noindent" ><code class="lstinline"><span style="color:#000000">integer</span><span style="color:#000000">,</span><span style="color:#000000"> </span><span style="color:#000000">intent</span><span style="color:#000000">(</span><span style="color:#000000">out</span><span style="color:#000000">)</span></code><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-6-"><td style="white-space:normal; text-align:left;" id="TBL-13-6-1"
class="td11"> <!--l. 773--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-13-6-2"
class="td11"> <!--l. 773--><p class="noindent" ><span
class="cmr-12">Error code. If no error, 0 is returned. See Section</span><span
class="cmr-12">&#x00A0;</span><a
href="userhtmlse7.html#x28-320007"><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-13-7-"><td style="white-space:normal; text-align:left;" id="TBL-13-7-1"
class="td11"> <!--l. 774--><p class="noindent" ><code class="lstinline"><span style="color:#000000">amold</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-13-7-2"
class="td11"> <!--l. 774--><p class="noindent" ><code class="lstinline"><span style="color:#000000">class</span><span style="color:#000000">(</span><span style="color:#000000">psb_</span></code><span
class="cmti-12">x</span><code class="lstinline"><span style="color:#000000">_base_sparse_mat</span><span style="color:#000000">),</span><span style="color:#000000"> </span><span style="color:#000000">intent</span><span style="color:#000000">(</span><span style="color:#000000">in</span><span style="color:#000000">),</span><span style="color:#000000"> </span><span style="color:#000000">optional</span></code><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-8-"><td style="white-space:normal; text-align:left;" id="TBL-13-8-1"
class="td11"> <!--l. 775--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-13-8-2"
class="td11"> <!--l. 775--><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&#8217;s Guide for details </span><span class="cite"><span
class="cmr-12">[</span><a
href="userhtmlli5.html#XPSBLASGUIDE"><span
class="cmr-12">21</span></a><span
class="cmr-12">]</span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-9-"><td style="white-space:normal; text-align:left;" id="TBL-13-9-1"
class="td11"> <!--l. 779--><p class="noindent" ><code class="lstinline"><span style="color:#000000">vmold</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-13-9-2"
class="td11"> <!--l. 779--><p class="noindent" ><code class="lstinline"><span style="color:#000000">class</span><span style="color:#000000">(</span><span style="color:#000000">psb_</span></code><span
class="cmti-12">x</span><code class="lstinline"><span style="color:#000000">_base_vect_type</span><span style="color:#000000">),</span><span style="color:#000000"> </span><span style="color:#000000">intent</span><span style="color:#000000">(</span><span style="color:#000000">in</span><span style="color:#000000">),</span><span style="color:#000000"> </span><span style="color:#000000">optional</span></code><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-10-"><td style="white-space:normal; text-align:left;" id="TBL-13-10-1"
class="td11"> <!--l. 780--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-13-10-2"
class="td11"> <!--l. 780--><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-13-11-"><td style="white-space:normal; text-align:left;" id="TBL-13-11-1"
class="td11"> <!--l. 782--><p class="noindent" ><code class="lstinline"><span style="color:#000000">imold</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-13-11-2"
class="td11"> <!--l. 782--><p class="noindent" ><code class="lstinline"><span style="color:#000000">class</span><span style="color:#000000">(</span><span style="color:#000000">psb_i_base_vect_type</span><span style="color:#000000">),</span><span style="color:#000000"> </span><span style="color:#000000">intent</span><span style="color:#000000">(</span><span style="color:#000000">in</span><span style="color:#000000">),</span><span style="color:#000000"> </span><span style="color:#000000">optional</span></code><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-12-"><td style="white-space:normal; text-align:left;" id="TBL-13-12-1"
class="td11"> <!--l. 783--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-13-12-2"
class="td11"> <!--l. 783--><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-13-13-"><td style="white-space:normal; text-align:left;" id="TBL-13-13-1"
class="td11"> </td> </tr></table> </div>
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