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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PCPreSolve"><H1>PCPreSolve</H1></A>
Optional pre-solve phase, intended for any preconditioner-specific actions that must be performed before the iterative solve itself.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode PCPreSolve(PC pc,KSP ksp)
</PRE>
Collective on <A HREF="../PC/PC.html#PC">PC</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>pc </B></TD><TD>- the preconditioner context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ksp </B></TD><TD>- the Krylov subspace context
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Sample of Usage</FONT></H3>
<PRE>
<A HREF="../PC/PCPreSolve.html#PCPreSolve">PCPreSolve</A>(pc,ksp);
<A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>(ksp,b,x);
<A HREF="../PC/PCPostSolve.html#PCPostSolve">PCPostSolve</A>(pc,ksp);
</PRE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The pre-solve phase is distinct from the <A HREF="../PC/PCSetUp.html#PCSetUp">PCSetUp</A>() phase.
<P>
<A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>() calls this directly, so is rarely called by the user.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../PC/PC.html#PC">PC</A>, pre-solve
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCPostSolve.html#PCPostSolve">PCPostSolve</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/interface/precon.c.html#PCPreSolve">src/ksp/pc/interface/precon.c</A>
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