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<A NAME="MatILUDTFactor"><H1>MatILUDTFactor</H1></A>
Performs a drop tolerance ILU factorization.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
int MatILUDTFactor(Mat mat,MatFactorInfo *info,IS row,IS col,Mat *fact)
</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>info </B></TD><TD>- information about the factorization to be done
</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></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>fact </B> -the factored matrix
<br>
<P>
<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 is currently only supported for the SeqAIJ matrix format using code
from Yousef Saad's SPARSEKIT2 package (translated to C with f2c) and/or
Matlab. SPARSEKIT2 is copyrighted by Yousef Saad with the GNU copyright
and thus can be distributed with PETSc.
<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>(), <A HREF="../Mat/MatFactorInfo.html#MatFactorInfo">MatFactorInfo</A>
<BR><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#MatILUDTFactor">src/mat/interface/matrix.c</A>
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