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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html >
<head><title>Method build</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="generator" content="TeX4ht (http://www.tug.org/tex4ht/)">
<meta name="originator" content="TeX4ht (http://www.tug.org/tex4ht/)">
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>
<!--l. 640--><div class="crosslinks"><p class="noindent"><span
class="cmbx-12">[</span><a
href="userhtmlsu15.html" ><span
class="cmbx-12">next</span></a><span
class="cmbx-12">] [</span><a
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class="cmbx-12">] [</span><a
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<h4 class="subsectionHead"><span class="titlemark"><span
class="cmbx-12">6.5 </span></span> <a
id="x24-230006.5"></a><span
class="cmbx-12">Method build</span></h4>
<div class="center"
>
<!--l. 642--><p class="noindent" >
<!--l. 643--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">call</span><span
class="cmtt-12">&#x00A0;p%build(a,desc_a,info[,amold,vmold,imold])</span></span></span><br />
</div>
<!--l. 646--><p class="noindent" ><span
class="cmbx-12">This method builds the preconditioner </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">p</span></span></span> <span
class="cmbx-12">according to the requirements</span>
<span
class="cmbx-12">made by the user through the methods </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">init</span></span></span> <span
class="cmbx-12">and </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">set</span></span></span> <span
class="cmbx-12">(see Sections</span><span
class="cmbx-12">&#x00A0;</span><a
href="userhtmlsu12.html#x22-210006.3"><span
class="cmbx-12">6.3</span><!--tex4ht:ref: sec:hier_bld --></a>
<span
class="cmbx-12">and</span><span
class="cmbx-12">&#x00A0;</span><a
href="userhtmlsu13.html#x23-220006.4"><span
class="cmbx-12">6.4</span><!--tex4ht:ref: sec:smooth_bld --></a> <span
class="cmbx-12">for multilevel preconditioners). It is mostly provided for backward</span>
<span
class="cmbx-12">compatibility; indeed, it is internally implemented by invoking the</span>
<span
class="cmbx-12">two previous methods </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">hierarchy_build</span></span></span> <span
class="cmbx-12">and </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">smoothers_build</span></span></span><span
class="cmbx-12">, whose</span>
<span
class="cmbx-12">nomenclature would however be somewhat unnatural when dealing with</span>
<span
class="cmbx-12">simple one-level preconditioners.</span>
<!--l. 656--><p class="noindent" ><span
class="cmbx-12">Arguments</span>
<div class="tabular"> <table id="TBL-13" class="tabular"
cellspacing="0" cellpadding="0"
><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:wrap; text-align:left;" id="TBL-13-1-1"
class="td11"><!--l. 659--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">a</span></span></span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-1-2"
class="td11"><!--l. 659--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">type(psb_</span></span></span><span
class="cmbxti-10x-x-120">x</span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">spmat_type),</span><span
class="cmtt-12">&#x00A0;intent(in)</span></span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-2-"><td style="white-space:wrap; text-align:left;" id="TBL-13-2-1"
class="td11"><!--l. 660--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-2-2"
class="td11"><!--l. 660--><p class="noindent" ><span
class="cmbx-12">The sparse matrix structure containing the local part</span>
<span
class="cmbx-12">of the matrix to be preconditioned. Note that </span><span
class="cmbxti-10x-x-120">x </span><span
class="cmbx-12">must</span>
<span
class="cmbx-12">be chosen according to the real/complex, single/double</span>
<span
class="cmbx-12">precision version of MLD2P4 under use. See the PSBLAS</span>
<span
class="cmbx-12">User&#8217;s Guide for details </span><span class="cite"><span
class="cmbx-12">[</span><a
href="userhtmlli4.html#XPSBLASGUIDE"><span
class="cmbx-12">15</span></a><span
class="cmbx-12">]</span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-3-"><td style="white-space:wrap; text-align:left;" id="TBL-13-3-1"
class="td11"><!--l. 664--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">desc_a</span></span></span></td><td style="white-space:wrap; text-align:left;" id="TBL-13-3-2"
class="td11"><!--l. 664--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">type(psb_desc_type),</span><span
class="cmtt-12">&#x00A0;intent(in)</span></span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-4-"><td style="white-space:wrap; text-align:left;" id="TBL-13-4-1"
class="td11"><!--l. 665--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-4-2"
class="td11"><!--l. 665--><p class="noindent" ><span
class="cmbx-12">The communication descriptor of </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">a</span></span></span><span
class="cmbx-12">. See the PSBLAS</span>
<span
class="cmbx-12">User&#8217;s Guide for details </span><span class="cite"><span
class="cmbx-12">[</span><a
href="userhtmlli4.html#XPSBLASGUIDE"><span
class="cmbx-12">15</span></a><span
class="cmbx-12">]</span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-5-"><td style="white-space:wrap; text-align:left;" id="TBL-13-5-1"
class="td11"><!--l. 667--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">info</span></span></span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-5-2"
class="td11"><!--l. 667--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">integer,</span><span
class="cmtt-12">&#x00A0;intent(out)</span></span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-6-"><td style="white-space:wrap; text-align:left;" id="TBL-13-6-1"
class="td11"><!--l. 668--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-6-2"
class="td11"><!--l. 668--><p class="noindent" ><span
class="cmbx-12">Error code. If no error, 0 is returned. See Section</span><span
class="cmbx-12">&#x00A0;</span><a
href="userhtmlse8.html#x30-340008"><span
class="cmbx-12">8</span><!--tex4ht:ref: sec:errors --></a> <span
class="cmbx-12">for</span>
<span
class="cmbx-12">details.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-7-"><td style="white-space:wrap; text-align:left;" id="TBL-13-7-1"
class="td11"><!--l. 669--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">amold</span></span></span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-7-2"
class="td11"><!--l. 669--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">class(psb_</span></span></span><span
class="cmbxti-10x-x-120">x</span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">_base_sparse_mat),</span><span
class="cmtt-12">&#x00A0;intent(in),</span><span
class="cmtt-12">&#x00A0;optional</span></span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-8-"><td style="white-space:wrap; text-align:left;" id="TBL-13-8-1"
class="td11"><!--l. 670--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-8-2"
class="td11"><!--l. 670--><p class="noindent" ><span
class="cmbx-12">The desired dynamic type for internal matrix components;</span>
<span
class="cmbx-12">this allows e.g. running on GPUs; it needs not be the same</span>
<span
class="cmbx-12">on all processes. See the PSBLAS User&#8217;s Guide for details</span>
<span class="cite"><span
class="cmbx-12">[</span><a
href="userhtmlli4.html#XPSBLASGUIDE"><span
class="cmbx-12">15</span></a><span
class="cmbx-12">]</span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-9-"><td style="white-space:wrap; text-align:left;" id="TBL-13-9-1"
class="td11"><!--l. 674--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">vmold</span></span></span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-9-2"
class="td11"><!--l. 674--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">class(psb_</span></span></span><span
class="cmbxti-10x-x-120">x</span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">_base_vect_type),</span><span
class="cmtt-12">&#x00A0;intent(in),</span><span
class="cmtt-12">&#x00A0;optional</span></span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-10-"><td style="white-space:wrap; text-align:left;" id="TBL-13-10-1"
class="td11"><!--l. 675--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-10-2"
class="td11"><!--l. 675--><p class="noindent" ><span
class="cmbx-12">The desired dynamic type for internal vector components;</span>
<span
class="cmbx-12">this allows e.g. running on GPUs.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-11-"><td style="white-space:wrap; text-align:left;" id="TBL-13-11-1"
class="td11"><!--l. 677--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">imold</span></span></span> </td><td style="white-space:wrap; text-align:left;" id="TBL-13-11-2"
class="td11"><!--l. 677--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">class(psb_i_base_vect_type),</span><span
class="cmtt-12">&#x00A0;intent(in),</span><span
class="cmtt-12">&#x00A0;optional</span></span></span><span
class="cmbx-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-12-"><td style="white-space:wrap; text-align:left;" id="TBL-13-12-1"
class="td11"><!--l. 678--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-13-12-2"
class="td11"><!--l. 678--><p class="noindent" ><span
class="cmbx-12">The desired dynamic type for internal integer vector</span>
<span
class="cmbx-12">components; this allows e.g. running on GPUs.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-13-13-"><td style="white-space:wrap; text-align:left;" id="TBL-13-13-1"
class="td11"> </td> </tr></table></div>
<!--l. 683--><p class="indent" > <span
class="cmbx-12">For compatibility with the previous versions of MLD2P4, this method</span>
<span
class="cmbx-12">can be also invoked as follows:</span>
<div class="center"
>
<!--l. 686--><p class="noindent" >
<!--l. 687--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">call</span><span
class="cmtt-12">&#x00A0;amg_precbld(p,what,val,info[,amold,vmold,imold])</span></span></span></div>
<!--l. 690--><p class="noindent" ><span
class="cmbx-12">The method can be used to build multilevel preconditioners too.</span>
<!--l. 695--><div class="crosslinks"><p class="noindent"><span
class="cmbx-12">[</span><a
href="userhtmlsu15.html" ><span
class="cmbx-12">next</span></a><span
class="cmbx-12">] [</span><a
href="userhtmlsu13.html" ><span
class="cmbx-12">prev</span></a><span
class="cmbx-12">] [</span><a
href="userhtmlsu13.html#tailuserhtmlsu13.html" ><span
class="cmbx-12">prev-tail</span></a><span
class="cmbx-12">] [</span><a
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class="cmbx-12">front</span></a><span
class="cmbx-12">] [</span><a
href="userhtmlse6.html#userhtmlsu14.html" ><span
class="cmbx-12">up</span></a><span
class="cmbx-12">] </span></p></div>
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id="tailuserhtmlsu14.html"></a>
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