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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatLUFactorSymbolic"><H1>MatLUFactorSymbolic</H1></A>
Performs symbolic LU factorization of matrix. Call this routine before calling <A HREF="../Mat/MatLUFactorNumeric.html#MatLUFactorNumeric">MatLUFactorNumeric</A>().
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatLUFactorSymbolic(Mat fact,Mat mat,IS row,IS col,const MatFactorInfo *info)
</PRE>
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>fact </B></TD><TD>- the factor matrix obtained with <A HREF="../Mat/MatGetFactor.html#MatGetFactor">MatGetFactor</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>row, col </B></TD><TD>- row and column permutations
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>info </B></TD><TD>- options for factorization, includes
</TD></TR></TABLE>
<pre>
fill - expected fill as ratio of original fill.
</pre>
<pre>
dtcol - pivot tolerance (0 no pivot, 1 full column pivoting)
</pre>
<pre>
Run with the option -info to determine an optimal value to use
</pre>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
See the <a href="../../docs/manual.pdf">users manual</a> for additional information about
choosing the fill factor for better efficiency.
<P>
Most users should employ the simplified <A HREF="../KSP/KSP.html#KSP">KSP</A> interface for linear solvers
instead of working directly with matrix algebra routines such as this.
See, e.g., <A HREF="../KSP/KSPCreate.html#KSPCreate">KSPCreate</A>().
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatLUFactor.html#MatLUFactor">MatLUFactor</A>(), <A HREF="../Mat/MatLUFactorNumeric.html#MatLUFactorNumeric">MatLUFactorNumeric</A>(), <A HREF="../Mat/MatCholeskyFactor.html#MatCholeskyFactor">MatCholeskyFactor</A>(), <A HREF="../Mat/MatFactorInfo.html#MatFactorInfo">MatFactorInfo</A>
<BR>
<P>
Developer Note: fortran interface is not autogenerated as the f90
interface defintion cannot be generated correctly [due to <A HREF="../Mat/MatFactorInfo.html#MatFactorInfo">MatFactorInfo</A>]
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matrix.c.html#MatLUFactorSymbolic">src/mat/interface/matrix.c</A>
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