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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatSetFromOptions"><H1>MatSetFromOptions</H1></A>
Creates a matrix where the type is determined from the options database. Generates a parallel MPI matrix if the communicator has more than one processor. The default matrix type is AIJ, using the routines <A HREF="../Mat/MatCreateSeqAIJ.html#MatCreateSeqAIJ">MatCreateSeqAIJ</A>() and <A HREF="../Mat/MatCreateAIJ.html#MatCreateAIJ">MatCreateAIJ</A>() if you do not select a type in the options database.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatSetFromOptions(Mat B)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>A </B> -the matrix
<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_type seqaij </B></TD><TD>- AIJ type, uses <A HREF="../Mat/MatCreateSeqAIJ.html#MatCreateSeqAIJ">MatCreateSeqAIJ</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_type mpiaij </B></TD><TD>- AIJ type, uses <A HREF="../Mat/MatCreateAIJ.html#MatCreateAIJ">MatCreateAIJ</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_type seqdense </B></TD><TD>- dense type, uses <A HREF="../Mat/MatCreateSeqDense.html#MatCreateSeqDense">MatCreateSeqDense</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_type mpidense </B></TD><TD>- dense type, uses <A HREF="../Mat/MatCreateDense.html#MatCreateDense">MatCreateDense</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_type seqbaij </B></TD><TD>- block AIJ type, uses <A HREF="../Mat/MatCreateSeqBAIJ.html#MatCreateSeqBAIJ">MatCreateSeqBAIJ</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-mat_type mpibaij </B></TD><TD>- block AIJ type, uses <A HREF="../Mat/MatCreateBAIJ.html#MatCreateBAIJ">MatCreateBAIJ</A>()
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Even More Options Database Keys</FONT></H3>
See the manpages for particular formats (e.g., <A HREF="../Mat/MatCreateSeqAIJ.html#MatCreateSeqAIJ">MatCreateSeqAIJ</A>())
for additional format-specific options.
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
matrix, create
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreateSeqAIJ.html#MatCreateSeqAIJ">MatCreateSeqAIJ</A>((), <A HREF="../Mat/MatCreateAIJ.html#MatCreateAIJ">MatCreateAIJ</A>(),
<BR><A HREF="../Mat/MatCreateSeqDense.html#MatCreateSeqDense">MatCreateSeqDense</A>(), <A HREF="../Mat/MatCreateDense.html#MatCreateDense">MatCreateDense</A>(),
<A HREF="../Mat/MatCreateSeqBAIJ.html#MatCreateSeqBAIJ">MatCreateSeqBAIJ</A>(), <A HREF="../Mat/MatCreateBAIJ.html#MatCreateBAIJ">MatCreateBAIJ</A>(),
<A HREF="../Mat/MatCreateSeqSBAIJ.html#MatCreateSeqSBAIJ">MatCreateSeqSBAIJ</A>(), <A HREF="../Mat/MatCreateSBAIJ.html#MatCreateSBAIJ">MatCreateSBAIJ</A>(),
<A HREF="../Mat/MatConvert.html#MatConvert">MatConvert</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/utils/gcreate.c.html#MatSetFromOptions">src/mat/utils/gcreate.c</A>
<BR><A HREF="./index.html">Index of all Mat 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/ex10.c.html">src/mat/examples/tutorials/ex10.c.html</A><BR>
<A HREF="../../../src/mat/examples/tutorials/ex15.c.html">src/mat/examples/tutorials/ex15.c.html</A><BR>
<A HREF="../../../src/mat/examples/tutorials/ex16.c.html">src/mat/examples/tutorials/ex16.c.html</A><BR>
<A HREF="../../../src/mat/examples/tutorials/ex17.c.html">src/mat/examples/tutorials/ex17.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex1.c.html">src/ksp/ksp/examples/tutorials/ex1.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex2.c.html">src/ksp/ksp/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex3.c.html">src/ksp/ksp/examples/tutorials/ex3.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex5.c.html">src/ksp/ksp/examples/tutorials/ex5.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex7.c.html">src/ksp/ksp/examples/tutorials/ex7.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex8.c.html">src/ksp/ksp/examples/tutorials/ex8.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex8g.c.html">src/ksp/ksp/examples/tutorials/ex8g.c.html</A><BR>
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