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<h4 class="subsectionHead"><span class="titlemark"><span
class="cmr-12">6.3 </span></span> <a
id="x22-210006.3"></a><span
class="cmr-12">Method hierarchy</span><span
class="cmr-12">_build</span></h4>
<div class="center"
>
<!--l. 664--><p class="noindent" >
<!--l. 665--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">call</span><span
class="cmtt-12"> p%hierarchy_build(a,desc_a,info)</span></span></span><br />
</div>
<!--l. 668--><p class="noindent" ><span
class="cmr-12">This method builds the hierarchy of matrices and restriction/prolongation operators for</span>
<span
class="cmr-12">the multilevel preconditioner </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">p</span></span></span><span
class="cmr-12">, according to the requirements made by the user</span>
<span
class="cmr-12">through the methods </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">init</span></span></span> <span
class="cmr-12">and </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">set</span></span></span><span
class="cmr-12">.</span>
<!--l. 673--><p class="noindent" ><span
class="cmbx-12">Arguments</span>
<div class="tabular"> <table id="TBL-11" class="tabular"
cellspacing="0" cellpadding="0"
><colgroup id="TBL-11-1g"><col
id="TBL-11-1"><col
id="TBL-11-2"></colgroup><tr
style="vertical-align:baseline;" id="TBL-11-1-"><td style="white-space:wrap; text-align:left;" id="TBL-11-1-1"
class="td11"><!--l. 676--><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-11-1-2"
class="td11"><!--l. 676--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">type(psb_</span></span></span><span
class="cmti-12">x</span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">spmat_type),</span><span
class="cmtt-12"> intent(in)</span></span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-2-"><td style="white-space:wrap; text-align:left;" id="TBL-11-2-1"
class="td11"><!--l. 677--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-11-2-2"
class="td11"><!--l. 677--><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</span>
<span
class="cmr-12">the real/complex, single/double precision version of MLD2P4 under</span>
<span
class="cmr-12">use. See the PSBLAS User’s Guide for details </span><span class="cite"><span
class="cmr-12">[</span><a
href="userhtmlli4.html#XPSBLASGUIDE"><span
class="cmr-12">13</span></a><span
class="cmr-12">]</span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-3-"><td style="white-space:wrap; text-align:left;" id="TBL-11-3-1"
class="td11"><!--l. 682--><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-11-3-2"
class="td11"><!--l. 682--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">type(psb_desc_type),</span><span
class="cmtt-12"> intent(in)</span></span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-4-"><td style="white-space:wrap; text-align:left;" id="TBL-11-4-1"
class="td11"><!--l. 683--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-11-4-2"
class="td11"><!--l. 683--><p class="noindent" ><span
class="cmr-12">The communication descriptor of </span><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">a</span></span></span><span
class="cmr-12">. See the PSBLAS User’s Guide</span>
<span
class="cmr-12">for details </span><span class="cite"><span
class="cmr-12">[</span><a
href="userhtmlli4.html#XPSBLASGUIDE"><span
class="cmr-12">13</span></a><span
class="cmr-12">]</span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-5-"><td style="white-space:wrap; text-align:left;" id="TBL-11-5-1"
class="td11"><!--l. 688--><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-11-5-2"
class="td11"><!--l. 688--><p class="noindent" ><span class="obeylines-h"><span class="verb"><span
class="cmtt-12">integer,</span><span
class="cmtt-12"> intent(out)</span></span></span><span
class="cmr-12">.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-6-"><td style="white-space:wrap; text-align:left;" id="TBL-11-6-1"
class="td11"><!--l. 689--><p class="noindent" > </td><td style="white-space:wrap; text-align:left;" id="TBL-11-6-2"
class="td11"><!--l. 689--><p class="noindent" ><span
class="cmr-12">Error code. If no error, 0 is returned. See Section</span><span
class="cmr-12"> </span><a
href="userhtmlse8.html#x30-340008"><span
class="cmr-12">8</span><!--tex4ht:ref: sec:errors --></a> <span
class="cmr-12">for details.</span> </td>
</tr><tr
style="vertical-align:baseline;" id="TBL-11-7-"><td style="white-space:wrap; text-align:left;" id="TBL-11-7-1"
class="td11"> </td> </tr></table></div>
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