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<head><title>Method smoothers_build</title>
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<!--l. 708--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">[</span><a
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class="cmr-12">next</span></a><span
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class="cmr-12">] [</span><a
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class="cmr-12">prev</span></a><span
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class="cmr-12">] [</span><a
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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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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">5.4 </span></span> <a
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id="x21-200005.4"></a><span
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class="cmr-12">Method smoothers</span><span
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class="cmr-12">_build</span></h4>
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<div class="center"
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>
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<!--l. 711--><p class="noindent" >
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<!--l. 712--><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">smoothers_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">p</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. 715--><p class="noindent" ><span
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class="cmr-12">This method builds the smoothers and the coarsest-level solvers for the multilevel</span>
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<span
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class="cmr-12">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 user through the methods</span>
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<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">, and based on the aggregation hierarchy produced by a previous call to</span>
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<span class="lstinline"></span><span
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class="cmtt-12">hierarchy_build</span> <span
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class="cmr-12">(see Section</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">).</span>
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<!--l. 722--><p class="noindent" ><span
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class="cmbx-12">Arguments</span>
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<div class="tabular"> <table id="TBL-12" class="tabular"
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cellspacing="0" cellpadding="0"
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><colgroup id="TBL-12-1g"><col
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id="TBL-12-1"><col
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id="TBL-12-2"></colgroup><tr
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style="vertical-align:baseline;" id="TBL-12-1-"><td style="white-space:wrap; text-align:left;" id="TBL-12-1-1"
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class="td11"><!--l. 725--><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-12-1-2"
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class="td11"><!--l. 725--><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-12-2-"><td style="white-space:wrap; text-align:left;" id="TBL-12-2-1"
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class="td11"><!--l. 726--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-12-2-2"
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class="td11"><!--l. 726--><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">20</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-12-3-"><td style="white-space:wrap; text-align:left;" id="TBL-12-3-1"
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class="td11"><!--l. 730--><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-12-3-2"
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class="td11"><!--l. 730--><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-12-4-"><td style="white-space:wrap; text-align:left;" id="TBL-12-4-1"
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class="td11"><!--l. 731--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-12-4-2"
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class="td11"><!--l. 731--><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">20</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-12-5-"><td style="white-space:wrap; text-align:left;" id="TBL-12-5-1"
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class="td11"><!--l. 733--><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-12-5-2"
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class="td11"><!--l. 733--><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-12-6-"><td style="white-space:wrap; text-align:left;" id="TBL-12-6-1"
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class="td11"><!--l. 734--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-12-6-2"
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class="td11"><!--l. 734--><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-12-7-"><td style="white-space:wrap; text-align:left;" id="TBL-12-7-1"
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class="td11"><!--l. 735--><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-12-7-2"
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class="td11"><!--l. 735--><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-12-8-"><td style="white-space:wrap; text-align:left;" id="TBL-12-8-1"
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class="td11"><!--l. 736--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-12-8-2"
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class="td11"><!--l. 736--><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">20</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-12-9-"><td style="white-space:wrap; text-align:left;" id="TBL-12-9-1"
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class="td11"><!--l. 740--><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-12-9-2"
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class="td11"><!--l. 740--><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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|
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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-12-10-"><td style="white-space:wrap; text-align:left;" id="TBL-12-10-1"
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class="td11"><!--l. 741--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-12-10-2"
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class="td11"><!--l. 741--><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-12-11-"><td style="white-space:wrap; text-align:left;" id="TBL-12-11-1"
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class="td11"><!--l. 743--><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-12-11-2"
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class="td11"><!--l. 743--><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-12-12-"><td style="white-space:wrap; text-align:left;" id="TBL-12-12-1"
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class="td11"><!--l. 744--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-12-12-2"
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class="td11"><!--l. 744--><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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style="vertical-align:baseline;" id="TBL-12-13-"><td style="white-space:wrap; text-align:left;" id="TBL-12-13-1"
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class="td11"> </td> </tr></table></div>
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class="cmr-12">prev-tail</span></a><span
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