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<head><title>Preconditioner routines</title>
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<!--l. 1--><div class="crosslinks"><p class="noindent">[<a
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href="userhtmlse9.html" >prev</a>] [<a
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<h3 class="sectionHead"><span class="titlemark">10 </span> <a
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id="x98-13500010"></a>Preconditioner routines</h3>
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<!--l. 6--><p class="noindent" >The base PSBLAS library contains the implementation of two simple preconditioning
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techniques:
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<ul class="itemize1">
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<li class="itemize">Diagonal Scaling
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</li>
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<li class="itemize">Block Jacobi with ILU(0) factorization</li></ul>
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<!--l. 14--><p class="noindent" >The supporting data type and subroutine interfaces are defined in the module
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_prec_mod</span></span></span>. The old interfaces <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_precinit</span></span></span> and <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_precbld</span></span></span> are still
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supported for backward compatibility
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<div class="subsectionTOCS">
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 <span class="subsectionToc" >10.1 <a
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href="userhtmlsu84.html#x99-13600010.1">init — Initialize a preconditioner</a></span>
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<br />  <span class="subsectionToc" >10.2 <a
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href="userhtmlsu85.html#x101-13700010.2">build — Builds a preconditioner</a></span>
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<br />  <span class="subsectionToc" >10.3 <a
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href="userhtmlsu86.html#x102-13800010.3">apply — Preconditioner application routine</a></span>
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<br />  <span class="subsectionToc" >10.4 <a
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href="userhtmlsu87.html#x103-13900010.4">descr — Prints a description of current preconditioner</a></span>
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<br />  <span class="subsectionToc" >10.5 <a
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href="userhtmlsu88.html#x104-14000010.5">clone — clone current preconditioner</a></span>
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<br />  <span class="subsectionToc" >10.6 <a
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href="userhtmlsu89.html#x105-14100010.6">free — Free a preconditioner</a></span>
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</div>
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