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<A NAME="MatMFFDSetBase"><H1>MatMFFDSetBase</H1></A>
Sets the vector U at which matrix vector products of the Jacobian are computed
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatMFFDSetBase(Mat J,Vec U,Vec F)
</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>J </B></TD><TD>- the <A HREF="../Mat/MatMFFD.html#MatMFFD">MatMFFD</A> matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>U </B></TD><TD>- the vector
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>F </B></TD><TD>- (optional) vector that contains F(u) if it has been already computed
</TD></TR></TABLE>
<P>
Notes: This is rarely used directly
<P>
If F is provided then it is not recomputed. Otherwise the function is evaluated at the base
point during the first <A HREF="../Mat/MatMult.html#MatMult">MatMult</A>() after each call to <A HREF="../Mat/MatMFFDSetBase.html#MatMFFDSetBase">MatMFFDSetBase</A>().
<P>
<P>
<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#MatMFFDSetBase">src/mat/impls/mffd/mffd.c</A>
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