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<TITLE>MatMFFDSetType</TITLE>
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<A NAME="MatMFFDSetType"><H1>MatMFFDSetType</H1></A>
Sets the method that is used to compute the differencing parameter for finite differene matrix-free formulations.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode PETSCMAT_DLLEXPORT MatMFFDSetType(Mat mat,MatMFFDType ftype)
</PRE>
<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="../Mat/MatCreateSNESMF.html#MatCreateSNESMF">MatCreateSNESMF</A>(), or <A HREF="../Mat/MatCreateMFFD.html#MatCreateMFFD">MatCreateMFFD</A>()
or <A HREF="../Mat/MatSetType.html#MatSetType">MatSetType</A>(mat,<A HREF="../Mat/MATMFFD.html#MATMFFD">MATMFFD</A>);
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ftype </B></TD><TD>- the type requested, either <A HREF="../Mat/MATMFFD_WP.html#MATMFFD_WP">MATMFFD_WP</A> or <A HREF="../Mat/MATMFFD_DS.html#MATMFFD_DS">MATMFFD_DS</A>
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
For example, such routines can compute h for use in
Jacobian-vector products of the form
<P>
F(x+ha) - F(x)
F'(u)a ~= ----------------
h
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreateSNESMF.html#MatCreateSNESMF">MatCreateSNESMF</A>(), <A HREF="../Mat/MatMFFDRegisterDynamic.html#MatMFFDRegisterDynamic">MatMFFDRegisterDynamic</A>)
<BR><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#MatMFFDSetType">src/mat/impls/mffd/mffd.c</A>
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