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   <div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatMFFDSetPeriod"><H1>MatMFFDSetPeriod</H1></A>
Sets how often h is recomputed, by default it is everytime 
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"   
PetscErrorCode  MatMFFDSetPeriod(Mat mat,PetscInt period)
</PRE>
Logically Collective on <A HREF="../Mat/Mat.html#Mat">Mat</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>mat </B></TD><TD>- the matrix free matrix created via <A HREF="../SNES/MatCreateSNESMF.html#MatCreateSNESMF">MatCreateSNESMF</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>period </B></TD><TD>- 1 for everytime, 2 for every second etc
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_mffd_period &lt;period&gt;</B></TD><TD>- 

</TD></TR>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
 <A HREF="../SNES/SNES.html#SNES">SNES</A>, matrix-free, parameters
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
 <A HREF="../SNES/MatCreateSNESMF.html#MatCreateSNESMF">MatCreateSNESMF</A>(),<A HREF="../Mat/MatMFFDGetH.html#MatMFFDGetH">MatMFFDGetH</A>(),
<BR><A HREF="../Mat/MatMFFDSetHHistory.html#MatMFFDSetHHistory">MatMFFDSetHHistory</A>(), <A HREF="../Mat/MatMFFDResetHHistory.html#MatMFFDResetHHistory">MatMFFDResetHHistory</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/impls/mffd/mffd.c.html#MatMFFDSetPeriod">src/mat/impls/mffd/mffd.c</A>
<BR><A HREF="./index.html">Index of all Mat routines</A>
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