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<TITLE>MatSchurComplementUpdate</TITLE>
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<A NAME="MatSchurComplementUpdate"><H1>MatSchurComplementUpdate</H1></A>
Updates the Schur complement matrix object with new submatrices
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
#include "petscksp.h"
PetscErrorCode PETSCMAT_DLLEXPORT MatSchurComplementUpdate(Mat N,Mat A,Mat Ap,Mat B,Mat C,Mat D,MatStructure str)
</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>N </B></TD><TD>- the matrix obtained with <A HREF="../KSP/MatCreateSchurComplement.html#MatCreateSchurComplement">MatCreateSchurComplement</A>()
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A,B,C,D </B></TD><TD>- the four parts of the original matrix (D is optional)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>str </B></TD><TD>- either SAME_NONZERO_PATTERN,DIFFERENT_NONZERO_PATTERN,SAME_PRECONDITIONER
</TD></TR></TABLE>
<P>
<P>
<P>
Notes: All four matrices must have the same MPI communicator
<P>
A and D must be square matrices
<P>
All of the matrices provided must have the same sizes as was used with <A HREF="../KSP/MatCreateSchurComplement.html#MatCreateSchurComplement">MatCreateSchurComplement</A>()
though they need not be the same matrices
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreateNormal.html#MatCreateNormal">MatCreateNormal</A>(), <A HREF="../Mat/MatMult.html#MatMult">MatMult</A>(), <A HREF="../Mat/MatCreate.html#MatCreate">MatCreate</A>(), <A HREF="../KSP/MatSchurComplementGetKSP.html#MatSchurComplementGetKSP">MatSchurComplementGetKSP</A>(), <A HREF="../KSP/MatCreateSchurComplement.html#MatCreateSchurComplement">MatCreateSchurComplement</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/utils/schurm.c.html#MatSchurComplementUpdate">src/ksp/ksp/utils/schurm.c</A>
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