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126 lines
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<head><title>init — Initialize a preconditioner</title>
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<h4 class="subsectionHead"><span class="titlemark">10.1 </span> <a
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id="x99-13600010.1"></a>init — Initialize a preconditioner</h4>
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<pre class="verbatim" id="verbatim-79">
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call prec%init(icontxt,ptype, info)
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</pre>
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<!--l. 30--><p class="nopar" >
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<!--l. 32--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Asynchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">icontxt</span> </dt><dd
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class="description">the communication context.<br
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class="newline" />Scope:<span
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class="cmbx-10">global</span>.<br
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class="newline" />Type:<span
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class="cmbx-10">required</span>.<br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: an integer value.
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</dd><dt class="description">
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<span
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class="cmbx-10">ptype</span> </dt><dd
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class="description">the type of preconditioner. Scope: <span
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class="cmbx-10">global </span><br
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class="newline" />Type: <span
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class="cmbx-10">required</span><br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: a character string, see usage notes.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Exit</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">prec</span> </dt><dd
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class="description">Scope: <span
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class="cmbx-10">local </span><br
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class="newline" />Type: <span
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class="cmbx-10">required</span><br
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class="newline" />Intent: <span
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class="cmbx-10">inout</span>.<br
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class="newline" />Specified as: a preconditioner data structure <a
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href="userhtmlsu8.html#precdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_prec</span><span
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class="cmtt-10">_type</span></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">info</span> </dt><dd
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class="description">Scope: <span
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class="cmbx-10">global </span><br
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class="newline" />Type: <span
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class="cmbx-10">required</span><br
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class="newline" />Intent: <span
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class="cmbx-10">out</span>.<br
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class="newline" />Error code: if no error, 0 is returned.</dd></dl>
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<!--l. 66--><p class="noindent" ><span
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class="cmbx-12">Notes </span>Legal inputs to this subroutine are interpreted depending on the <span
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class="cmmi-10">ptype </span>string as
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follows<span class="footnote-mark"><a
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href="userhtml100.html#fn4x0"><sup class="textsuperscript">4</sup></a></span><a
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id="x99-136001f4"></a> :
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">NONE</span> </dt><dd
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class="description">No preconditioning, i.e. the preconditioner is just a copy operator.
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</dd><dt class="description">
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<span
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class="cmbx-10">DIAG</span> </dt><dd
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class="description">Diagonal scaling; each entry of the input vector is multiplied by the
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reciprocal of the sum of the absolute values of the coefficients in the
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corresponding row of matrix <span
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class="cmmi-10">A</span>;
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</dd><dt class="description">
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<span
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class="cmbx-10">BJAC</span> </dt><dd
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class="description">Precondition by a factorization of the block-diagonal of matrix <span
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class="cmmi-10">A</span>,
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where block boundaries are determined by the data allocation boundaries
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for each process; requires no communication. Only the incomplete
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factorization <span
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class="cmmi-10">ILU</span>(0) is currently implemented.</dd></dl>
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