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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="PCSetUseAmat"><H1>PCSetUseAmat</H1></A>
Sets a flag to indicate that when the preconditioner needs to apply (part of) the operator during the preconditioning process it applies the Amat provided to <A HREF="../TS/TSSetRHSJacobian.html#TSSetRHSJacobian">TSSetRHSJacobian</A>(), <A HREF="../TS/TSSetIJacobian.html#TSSetIJacobian">TSSetIJacobian</A>(), <A HREF="../SNES/SNESSetJacobian.html#SNESSetJacobian">SNESSetJacobian</A>(), KSPSetOperator() or PCSetOperator() not the Pmat.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../PC/PCSetUseAmat.html#PCSetUseAmat">PCSetUseAmat</A>(<A HREF="../PC/PC.html#PC">PC</A> pc,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> flg)
</PRE>
Logically 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>flg </B></TD><TD>- <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> to use the Amat, <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> to use the Pmat (default is false)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Key</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_use_amat <true,false></B></TD></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
For the common case in which the linear system matrix and the matrix used to construct the
preconditioner are identical, this routine is does nothing.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCGetUseAmat.html#PCGetUseAmat">PCGetUseAmat</A>(), <A HREF="../PC/PCBJACOBI.html#PCBJACOBI">PCBJACOBI</A>, PGMG, <A HREF="../PC/PCFIELDSPLIT.html#PCFIELDSPLIT">PCFIELDSPLIT</A>, <A HREF="../PC/PCCOMPOSITE.html#PCCOMPOSITE">PCCOMPOSITE</A>
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/pc/interface/precon.c.html#PCSetUseAmat">src/ksp/pc/interface/precon.c</A>
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