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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatSchurComplementSet"><H1>MatSchurComplementSet</H1></A>
Sets the matrices that define the Schur complement
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode MatSchurComplementSet(Mat N,Mat A00,Mat Ap00,Mat A01,Mat A10,Mat A11)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>N </B></TD><TD>- matrix obtained with <A HREF="../Mat/MatCreate.html#MatCreate">MatCreate</A>() and <A HREF="../Mat/MatSetType.html#MatSetType">MatSetType</A>(MATSCHURCOMPLEMENT);
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A00,A01,A10,A11 </B></TD><TD>- the four parts of the original matrix (A00 is optional)
</TD></TR></TABLE>
<P>
<P>
Notes: The Schur complement is NOT actually formed! Rather this
object performs the matrix-vector product by using the the formula for
the Schur complement and a <A HREF="../KSP/KSP.html#KSP">KSP</A> solver to approximate the action of inv(A)
<P>
All four matrices must have the same MPI communicator
<P>
A00 and A11 must be square 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/MatSchurComplementUpdate.html#MatSchurComplementUpdate">MatSchurComplementUpdate</A>(), <A HREF="../Mat/MatCreateTranspose.html#MatCreateTranspose">MatCreateTranspose</A>(), <A HREF="../KSP/MatGetSchurComplement.html#MatGetSchurComplement">MatGetSchurComplement</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#MatSchurComplementSet">src/ksp/ksp/utils/schurm.c</A>
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