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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatFDColoringSetFromOptions"><H1>MatFDColoringSetFromOptions</H1></A>
Sets coloring finite difference parameters from the options database.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatFDColoringSetFromOptions(MatFDColoring matfd)
</PRE>
Collective on <A HREF="../Mat/MatFDColoring.html#MatFDColoring">MatFDColoring</A>
<P>
The Jacobian, F'(u), is estimated with the differencing approximation
<PRE>
F'(u)_{:,i} = [F(u+h*dx_{i}) - F(u)]/h where
h = error_rel*u[i] if abs(u[i]) > umin
= +/- error_rel*umin otherwise, with +/- determined by the sign of u[i]
dx_{i} = (0, ... 1, .... 0)
</PRE>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>coloring </B> -the coloring context
<br>
<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_coloring_err <err> </B></TD><TD>- Sets <err> (square root
of relative error in the function)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_fd_coloring_umin <umin> </B></TD><TD>- Sets umin, the minimum allowable u-value magnitude
</TD></TR>
<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
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_fd_coloring_view ::ascii_info </B></TD><TD>- Activates viewing info
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_fd_coloring_view draw </B></TD><TD>- Activates drawing
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../Mat/Mat.html#Mat">Mat</A>, finite differences, parameters
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../MatFD/MatFDColoringCreate.html#MatFDColoringCreate">MatFDColoringCreate</A>(), <A HREF="../MatFD/MatFDColoringView.html#MatFDColoringView">MatFDColoringView</A>(), <A HREF="../MatFD/MatFDColoringSetParameters.html#MatFDColoringSetParameters">MatFDColoringSetParameters</A>()
<BR>
<P>
<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#MatFDColoringSetFromOptions">src/mat/matfd/fdmatrix.c</A>
<BR><A HREF="./index.html">Index of all MatFD routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/mat/examples/tutorials/ex16.c.html">src/mat/examples/tutorials/ex16.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex5s.c.html">src/snes/examples/tutorials/ex5s.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex14.c.html">src/snes/examples/tutorials/ex14.c.html</A><BR>
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