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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatFDColoringApply"><H1>MatFDColoringApply</H1></A>
Given a matrix for which a <A HREF="../Mat/MatFDColoring.html#MatFDColoring">MatFDColoring</A> context has been created, computes the Jacobian for a function via finite differences.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatFDColoringApply(Mat J,MatFDColoring coloring,Vec x1,MatStructure *flag,void *sctx)
</PRE>
Collective on <A HREF="../Mat/MatFDColoring.html#MatFDColoring">MatFDColoring</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>- location to store Jacobian
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>coloring </B></TD><TD>- coloring context created with <A HREF="../MatFD/MatFDColoringCreate.html#MatFDColoringCreate">MatFDColoringCreate</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x1 </B></TD><TD>- location at which Jacobian is to be computed
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>sctx </B></TD><TD>- context required by function, if this is being used with the <A HREF="../SNES/SNES.html#SNES">SNES</A> solver then it is <A HREF="../SNES/SNES.html#SNES">SNES</A> object, otherwise it is null
</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_fd_type </B></TD><TD>- "wp" or "ds" (see <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>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_fd_coloring_view </B></TD><TD>- Activates basic viewing or coloring
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_fd_coloring_view draw </B></TD><TD>- Activates drawing of coloring
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_fd_coloring_view ::ascii_info </B></TD><TD>- Activates viewing of coloring info
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../MatFD/MatFDColoringCreate.html#MatFDColoringCreate">MatFDColoringCreate</A>(), <A HREF="../MatFD/MatFDColoringDestroy.html#MatFDColoringDestroy">MatFDColoringDestroy</A>(), <A HREF="../MatFD/MatFDColoringView.html#MatFDColoringView">MatFDColoringView</A>(), <A HREF="../MatFD/MatFDColoringSetFunction.html#MatFDColoringSetFunction">MatFDColoringSetFunction</A>()
<BR>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
coloring, Jacobian, finite differences
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/matfd/fdmatrix.c.html#MatFDColoringApply">src/mat/matfd/fdmatrix.c</A>
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