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<head><title>Preconditioner routines</title>
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<h3 class="sectionHead"><span class="titlemark">10 </span> <a
id="x98-13500010"></a>Preconditioner routines</h3>
<!--l. 6--><p class="noindent" >The base PSBLAS library contains the implementation of two simple preconditioning
techniques:
<ul class="itemize1">
<li class="itemize">Diagonal Scaling
</li>
<li class="itemize">Block Jacobi with ILU(0) factorization</li></ul>
<!--l. 14--><p class="noindent" >The supporting data type and subroutine interfaces are defined in the module
<span class="obeylines-h"><span class="verb"><span
class="cmtt-10">psb_prec_mod</span></span></span>. The old interfaces <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">psb_precinit</span></span></span> and <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">psb_precbld</span></span></span> are still
supported for backward compatibility
<div class="subsectionTOCS">
&#x00A0;<span class="subsectionToc" >10.1 <a
href="userhtmlsu84.html#x99-13600010.1">init &#8212; Initialize a preconditioner</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.2 <a
href="userhtmlsu85.html#x101-13700010.2">build &#8212; Builds a preconditioner</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.3 <a
href="userhtmlsu86.html#x102-13800010.3">apply &#8212; Preconditioner application routine</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.4 <a
href="userhtmlsu87.html#x103-13900010.4">descr &#8212; Prints a description of current preconditioner</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.5 <a
href="userhtmlsu88.html#x104-14000010.5">clone &#8212; clone current preconditioner</a></span>
<br /> &#x00A0;<span class="subsectionToc" >10.6 <a
href="userhtmlsu89.html#x105-14100010.6">free &#8212; Free a preconditioner</a></span>
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