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<head><title>Method build</title>
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</head><body
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>
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<!--l. 743--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">[</span><a
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href="userhtmlsu12.html" ><span
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class="cmr-12">next</span></a><span
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class="cmr-12">] [</span><a
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href="userhtmlsu10.html" ><span
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class="cmr-12">prev</span></a><span
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class="cmr-12">] [</span><a
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href="userhtmlsu10.html#tailuserhtmlsu10.html" ><span
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class="cmr-12">prev-tail</span></a><span
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class="cmr-12">] [</span><a
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href="#tailuserhtmlsu11.html"><span
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class="cmr-12">tail</span></a><span
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class="cmr-12">] [</span><a
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href="userhtmlse5.html#userhtmlsu11.html" ><span
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class="cmr-12">up</span></a><span
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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="x21-200005.5"></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. 745--><p class="noindent" >
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<!--l. 746--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">call</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">p</span><span
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class="cmtt-12">%</span><span
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class="cmtt-12">build</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">a</span><span
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class="cmtt-12">,</span><span
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class="cmtt-12">desc_a</span><span
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class="cmtt-12">,</span><span
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class="cmtt-12">info</span><span
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class="cmtt-12">[,</span><span
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class="cmtt-12">amold</span><span
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class="cmtt-12">,</span><span
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class="cmtt-12">vmold</span><span
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class="cmtt-12">,</span><span
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class="cmtt-12">imold</span><span
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class="cmtt-12">])</span><br />
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</div>
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<!--l. 749--><p class="noindent" ><span
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class="cmr-12">This method builds the preconditioner </span><span class="lstinline"></span><span
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class="cmtt-12">p</span> <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><span class="lstinline"></span><span
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class="cmtt-12">init</span> <span
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class="cmr-12">and </span><span class="lstinline"></span><span
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class="cmtt-12">set</span> <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="userhtmlsu9.html#x19-180005.3"><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="userhtmlsu10.html#x20-190005.4"><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><span class="lstinline"></span><span
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class="cmtt-12">hierarchy_build</span> <span
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class="cmr-12">and</span>
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<span class="lstinline"></span><span
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class="cmtt-12">smoothers_build</span><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. 759--><p class="noindent" ><span
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class="cmbx-12">Arguments</span>
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<div class="tabular"> <table id="TBL-13" class="tabular"
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cellspacing="0" cellpadding="0"
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><colgroup id="TBL-13-1g"><col
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id="TBL-13-1"><col
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id="TBL-13-2"></colgroup><tr
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style="vertical-align:baseline;" id="TBL-13-1-"><td style="white-space:wrap; text-align:left;" id="TBL-13-1-1"
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class="td11"><!--l. 762--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">a</span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-1-2"
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class="td11"><!--l. 762--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">type</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">psb_</span><span
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class="cmti-12">x</span><span class="lstinline"></span><span
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class="cmtt-12">spmat_type</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">in</span><span
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class="cmtt-12">)</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-13-2-"><td style="white-space:wrap; text-align:left;" id="TBL-13-2-1"
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class="td11"><!--l. 763--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-2-2"
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class="td11"><!--l. 763--><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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<span class="lstinline"></span><span
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class="cmtt-12">real</span><span
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class="cmr-12">/</span><span class="lstinline"></span><span
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class="cmtt-12">complex</span><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">18</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-13-3-"><td style="white-space:wrap; text-align:left;" id="TBL-13-3-1"
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class="td11"><!--l. 767--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">desc_a</span></td><td style="white-space:wrap; text-align:left;" id="TBL-13-3-2"
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class="td11"><!--l. 767--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">type</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">psb_desc_type</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">in</span><span
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class="cmtt-12">)</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-13-4-"><td style="white-space:wrap; text-align:left;" id="TBL-13-4-1"
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class="td11"><!--l. 768--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-4-2"
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class="td11"><!--l. 768--><p class="noindent" ><span
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class="cmr-12">The communication descriptor of </span><span class="lstinline"></span><span
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class="cmtt-12">a</span><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">18</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-13-5-"><td style="white-space:wrap; text-align:left;" id="TBL-13-5-1"
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class="td11"><!--l. 770--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">info</span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-5-2"
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class="td11"><!--l. 770--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">integer</span><span
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class="cmtt-12">,</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">out</span><span
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class="cmtt-12">)</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-13-6-"><td style="white-space:wrap; text-align:left;" id="TBL-13-6-1"
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class="td11"><!--l. 771--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-6-2"
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class="td11"><!--l. 771--><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#x27-310007"><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-13-7-"><td style="white-space:wrap; text-align:left;" id="TBL-13-7-1"
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class="td11"><!--l. 772--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">amold</span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-7-2"
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class="td11"><!--l. 772--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">class</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">psb_</span><span
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class="cmti-12">x</span><span class="lstinline"></span><span
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class="cmtt-12">_base_sparse_mat</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">in</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">optional</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-13-8-"><td style="white-space:wrap; text-align:left;" id="TBL-13-8-1"
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class="td11"><!--l. 773--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-8-2"
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class="td11"><!--l. 773--><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">18</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-13-9-"><td style="white-space:wrap; text-align:left;" id="TBL-13-9-1"
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class="td11"><!--l. 777--><p class="noindent" ><span class="lstinline"></span><span
|
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class="cmtt-12">vmold</span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-9-2"
|
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class="td11"><!--l. 777--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">class</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">psb_</span><span
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class="cmti-12">x</span><span class="lstinline"></span><span
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class="cmtt-12">_base_vect_type</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">in</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">optional</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-13-10-"><td style="white-space:wrap; text-align:left;" id="TBL-13-10-1"
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class="td11"><!--l. 778--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-10-2"
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class="td11"><!--l. 778--><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-13-11-"><td style="white-space:wrap; text-align:left;" id="TBL-13-11-1"
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class="td11"><!--l. 780--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">imold</span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-11-2"
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class="td11"><!--l. 780--><p class="noindent" ><span class="lstinline"></span><span
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class="cmtt-12">class</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">psb_i_base_vect_type</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">intent</span><span
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class="cmtt-12">(</span><span
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class="cmtt-12">in</span><span
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class="cmtt-12">),</span><span
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class="cmtt-12"> </span><span
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class="cmtt-12">optional</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-13-12-"><td style="white-space:wrap; text-align:left;" id="TBL-13-12-1"
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class="td11"><!--l. 781--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-12-2"
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class="td11"><!--l. 781--><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-13-13-"><td style="white-space:wrap; text-align:left;" id="TBL-13-13-1"
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class="td11"> </td> </tr></table></div>
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<!--l. 786--><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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