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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
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<A NAME="SNESGetUseMatrixFree"><H1>SNESGetUseMatrixFree</H1></A>
indicates if the <A HREF="../SNES/SNES.html#SNES">SNES</A> uses matrix free finite difference matrix vector products to apply the Jacobian.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsnes.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../SNES/SNESGetUseMatrixFree.html#SNESGetUseMatrixFree">SNESGetUseMatrixFree</A>(<A HREF="../SNES/SNES.html#SNES">SNES</A> snes,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> *mf_operator,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> *mf)
</PRE>
Collective on <A HREF="../SNES/SNES.html#SNES">SNES</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>snes </B> -<A HREF="../SNES/SNES.html#SNES">SNES</A> context
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mf </B></TD><TD>- use matrix-free for both the Amat and Pmat used by <A HREF="../SNES/SNESSetJacobian.html#SNESSetJacobian">SNESSetJacobian</A>(), both the Amat and Pmat set in <A HREF="../SNES/SNESSetJacobian.html#SNESSetJacobian">SNESSetJacobian</A>() will be ignored
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mf_operator </B></TD><TD>- use matrix-free only for the Amat used by <A HREF="../SNES/SNESSetJacobian.html#SNESSetJacobian">SNESSetJacobian</A>(), this means the user provided Pmat will continue to be used
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_mf </B></TD><TD>- use matrix free for both the mat and pmat operator
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-snes_mf_operator </B></TD><TD>- use matrix free only for the mat operator
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../SNES/SNES.html#SNES">SNES</A>, nonlinear, get, iteration, number,
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../SNES/SNESSetUseMatrixFree.html#SNESSetUseMatrixFree">SNESSetUseMatrixFree</A>(), <A HREF="../SNES/MatCreateSNESMF.html#MatCreateSNESMF">MatCreateSNESMF</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/snes/interface/snes.c.html#SNESGetUseMatrixFree">src/snes/interface/snes.c</A>
<BR><A HREF="./index.html">Index of all SNES routines</A>
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