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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<A NAME="MatLUFactor"><H1>MatLUFactor</H1></A>
Performs in-place LU factorization of matrix.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatLUFactor.html#MatLUFactor">MatLUFactor</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> mat,<A HREF="../IS/IS.html#IS">IS</A> row,<A HREF="../IS/IS.html#IS">IS</A> col,const <A HREF="../Mat/MatFactorInfo.html#MatFactorInfo">MatFactorInfo</A> *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>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>row </B></TD><TD>- row permutation
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>col </B></TD><TD>- column permutation
</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>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
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>
This changes the state of the matrix to a factored matrix; it cannot be used
for example with <A HREF="../Mat/MatSetValues.html#MatSetValues">MatSetValues</A>() unless one first calls <A HREF="../Mat/MatSetUnfactored.html#MatSetUnfactored">MatSetUnfactored</A>().
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatLUFactorSymbolic.html#MatLUFactorSymbolic">MatLUFactorSymbolic</A>(), <A HREF="../Mat/MatLUFactorNumeric.html#MatLUFactorNumeric">MatLUFactorNumeric</A>(), <A HREF="../Mat/MatCholeskyFactor.html#MatCholeskyFactor">MatCholeskyFactor</A>(),
<BR><A HREF="../MatOrderings/MatGetOrdering.html#MatGetOrdering">MatGetOrdering</A>(), <A HREF="../Mat/MatSetUnfactored.html#MatSetUnfactored">MatSetUnfactored</A>(), <A HREF="../Mat/MatFactorInfo.html#MatFactorInfo">MatFactorInfo</A>, <A HREF="../Mat/MatGetFactor.html#MatGetFactor">MatGetFactor</A>()
<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></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/interface/matrix.c.html#MatLUFactor">src/mat/interface/matrix.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ksp/ksp/tutorials/ex74.c.html">src/ksp/ksp/tutorials/ex74.c.html</A><BR>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/mat/impls/aij/seq/aijfact.c.html#MatLUFactor_SeqAIJ">MatLUFactor_SeqAIJ in src/mat/impls/aij/seq/aijfact.c</A><BR>
<A HREF="../../../src/mat/impls/baij/seq/baijfact.c.html#MatLUFactor_SeqBAIJ">MatLUFactor_SeqBAIJ in src/mat/impls/baij/seq/baijfact.c</A><BR>
<A HREF="../../../src/mat/impls/dense/seq/cuda/densecuda.cu.html#MatLUFactor_SeqDenseCUDA">MatLUFactor_SeqDenseCUDA in src/mat/impls/dense/seq/cuda/densecuda.cu</A><BR>
<A HREF="../../../src/mat/impls/dense/seq/dense.c.html#MatLUFactor_SeqDense">MatLUFactor_SeqDense in src/mat/impls/dense/seq/dense.c</A><BR>
<A HREF="../../../src/mat/impls/elemental/matelem.cxx.html#MatLUFactor_Elemental">MatLUFactor_Elemental in src/mat/impls/elemental/matelem.cxx</A><BR>
<A HREF="../../../src/mat/impls/scalapack/matscalapack.c.html#MatLUFactor_ScaLAPACK">MatLUFactor_ScaLAPACK in src/mat/impls/scalapack/matscalapack.c</A><BR>
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