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<!--l. 789--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">[</span><a
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class="cmr-12">] </span></p></div>
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<h4 class="subsectionHead"><span class="titlemark"><span
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class="cmr-12">5.5 </span></span> <a
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id="x22-210005.5"></a><span
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class="cmr-12">Method build</span></h4>
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<div class="center"
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>
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<!--l. 791--><p class="noindent" >
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<!--l. 792--><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">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">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 />
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</div>
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<!--l. 795--><p class="noindent" ><span
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class="cmr-12">This method builds the preconditioner </span><code class="lstinline"><span style="color:#000000">p</span></code> <span
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class="cmr-12">according to the requirements made by the</span>
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<span
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class="cmr-12">user through the methods </span><code class="lstinline"><span style="color:#000000">init</span></code> <span
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class="cmr-12">and </span><code class="lstinline"><span style="color:#000000">set</span></code> <span
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class="cmr-12">(see Sections</span><span
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class="cmr-12"> </span><a
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href="userhtmlsu10.html#x20-190005.3"><span
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class="cmr-12">5.3</span><!--tex4ht:ref: sec:hier_bld --></a> <span
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class="cmr-12">and</span><span
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class="cmr-12"> </span><a
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href="userhtmlsu11.html#x21-200005.4"><span
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class="cmr-12">5.4</span><!--tex4ht:ref: sec:smooth_bld --></a> <span
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class="cmr-12">for multilevel</span>
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<span
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class="cmr-12">preconditioners). It is mostly provided for backward compatibility; indeed, it is</span>
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<span
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class="cmr-12">internally implemented by invoking the two previous methods </span><code class="lstinline"><span style="color:#000000">hierarchy_build</span></code> <span
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class="cmr-12">and</span>
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<code class="lstinline"><span style="color:#000000">smoothers_build</span></code><span
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class="cmr-12">, whose nomenclature would however be somewhat unnatural when</span>
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<span
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class="cmr-12">dealing with simple one-level preconditioners.</span>
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<!--l. 805--><p class="noindent" ><span
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class="cmbx-12">Arguments</span>
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<div class="tabular"> <table id="TBL-14" class="tabular"
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><colgroup id="TBL-14-1g"><col
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id="TBL-14-1"><col
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id="TBL-14-2"></colgroup><tr
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style="vertical-align:baseline;" id="TBL-14-1-"><td style="white-space:normal; text-align:left;" id="TBL-14-1-1"
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class="td11"> <!--l. 808--><p class="noindent" ><code class="lstinline"><span style="color:#000000">a</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-14-1-2"
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class="td11"> <!--l. 808--><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
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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
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-2-"><td style="white-space:normal; text-align:left;" id="TBL-14-2-1"
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class="td11"> <!--l. 809--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-14-2-2"
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class="td11"> <!--l. 809--><p class="noindent" ><span
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class="cmr-12">The sparse matrix structure containing the local part of the matrix</span>
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<span
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class="cmr-12">to be preconditioned. Note that </span><span
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class="cmti-12">x </span><span
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class="cmr-12">must be chosen according to the</span>
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<code class="lstinline"><span style="color:#000000">real</span></code><span
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class="cmr-12">/</span><code class="lstinline"><span style="color:#000000">complex</span></code><span
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class="cmr-12">, single/double precision version of AMG4PSBLAS</span>
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<span
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class="cmr-12">under use. See the PSBLAS User’s Guide for details </span><span class="cite"><span
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class="cmr-12">[</span><a
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href="userhtmlli5.html#XPSBLASGUIDE"><span
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class="cmr-12">21</span></a><span
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class="cmr-12">]</span></span><span
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-3-"><td style="white-space:normal; text-align:left;" id="TBL-14-3-1"
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class="td11"> <!--l. 813--><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-14-3-2"
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class="td11"> <!--l. 813--><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
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-4-"><td style="white-space:normal; text-align:left;" id="TBL-14-4-1"
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class="td11"> <!--l. 814--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-14-4-2"
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class="td11"> <!--l. 814--><p class="noindent" ><span
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class="cmr-12">The communication descriptor of </span><code class="lstinline"><span style="color:#000000">a</span></code><span
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class="cmr-12">. See the PSBLAS User’s Guide</span>
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<span
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class="cmr-12">for details </span><span class="cite"><span
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class="cmr-12">[</span><a
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href="userhtmlli5.html#XPSBLASGUIDE"><span
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class="cmr-12">21</span></a><span
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class="cmr-12">]</span></span><span
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-5-"><td style="white-space:normal; text-align:left;" id="TBL-14-5-1"
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class="td11"> <!--l. 816--><p class="noindent" ><code class="lstinline"><span style="color:#000000">info</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-14-5-2"
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class="td11"> <!--l. 816--><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
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-6-"><td style="white-space:normal; text-align:left;" id="TBL-14-6-1"
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class="td11"> <!--l. 817--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-14-6-2"
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class="td11"> <!--l. 817--><p class="noindent" ><span
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class="cmr-12">Error code. If no error, 0 is returned. See Section</span><span
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class="cmr-12"> </span><a
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href="userhtmlse7.html#x28-320007"><span
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class="cmr-12">7</span><!--tex4ht:ref: sec:errors --></a> <span
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class="cmr-12">for details.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-7-"><td style="white-space:normal; text-align:left;" id="TBL-14-7-1"
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class="td11"> <!--l. 818--><p class="noindent" ><code class="lstinline"><span style="color:#000000">amold</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-14-7-2"
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class="td11"> <!--l. 818--><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
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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
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-8-"><td style="white-space:normal; text-align:left;" id="TBL-14-8-1"
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class="td11"> <!--l. 819--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-14-8-2"
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class="td11"> <!--l. 819--><p class="noindent" ><span
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class="cmr-12">The desired dynamic type for internal matrix components; this</span>
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<span
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class="cmr-12">allows e.g. running on GPUs; it needs not be the same on all</span>
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<span
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class="cmr-12">processes. See the PSBLAS User’s Guide for details </span><span class="cite"><span
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class="cmr-12">[</span><a
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href="userhtmlli5.html#XPSBLASGUIDE"><span
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class="cmr-12">21</span></a><span
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class="cmr-12">]</span></span><span
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-9-"><td style="white-space:normal; text-align:left;" id="TBL-14-9-1"
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class="td11"> <!--l. 823--><p class="noindent" ><code class="lstinline"><span style="color:#000000">vmold</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-14-9-2"
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class="td11"> <!--l. 823--><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
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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
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-10-"><td style="white-space:normal; text-align:left;" id="TBL-14-10-1"
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class="td11"> <!--l. 824--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-14-10-2"
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class="td11"> <!--l. 824--><p class="noindent" ><span
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class="cmr-12">The desired dynamic type for internal vector components; this</span>
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<span
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class="cmr-12">allows e.g. running on GPUs.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-11-"><td style="white-space:normal; text-align:left;" id="TBL-14-11-1"
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class="td11"> <!--l. 826--><p class="noindent" ><code class="lstinline"><span style="color:#000000">imold</span></code> </td><td style="white-space:normal; text-align:left;" id="TBL-14-11-2"
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class="td11"> <!--l. 826--><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
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class="cmr-12">.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-12-"><td style="white-space:normal; text-align:left;" id="TBL-14-12-1"
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class="td11"> <!--l. 827--><p class="noindent" > </td><td style="white-space:normal; text-align:left;" id="TBL-14-12-2"
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class="td11"> <!--l. 827--><p class="noindent" ><span
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class="cmr-12">The desired dynamic type for internal integer vector components;</span>
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<span
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class="cmr-12">this allows e.g. running on GPUs.</span> </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-14-13-"><td style="white-space:normal; text-align:left;" id="TBL-14-13-1"
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class="td11"> </td> </tr></table> </div>
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<!--l. 832--><p class="noindent" ><span
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class="cmr-12">The method can be used to build multilevel preconditioners too.</span>
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<!--l. 837--><div class="crosslinks"><p class="noindent"><span
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