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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="MatSchurComplementGetSubMatrices"><H1>MatSchurComplementGetSubMatrices</H1></A>
Get the individual submatrices in the Schur complement
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscksp.h"
PetscErrorCode MatSchurComplementGetSubMatrices(Mat S,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>
<DT><B>S </B> -matrix obtained with <A HREF="../KSP/MatCreateSchurComplement.html#MatCreateSchurComplement">MatCreateSchurComplement</A>() (or equivalent) and implementing the action of A11 - A10 ksp(A00,Ap00) A01
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Paramters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<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 A = [A00 A01; A10 A11] (A11 is optional)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>Ap00 </B></TD><TD>- preconditioning matrix for use in ksp(A00,Ap00) to approximate the action of A^{-1}.
</TD></TR></TABLE>
<P>
Note: A11 is optional, and thus can be NULL. The submatrices are not increfed before they are returned and should not be modified or destroyed.
<P>
<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>(), <A HREF="../KSP/MatSchurComplementUpdateSubMatrices.html#MatSchurComplementUpdateSubMatrices">MatSchurComplementUpdateSubMatrices</A>()
<BR><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#MatSchurComplementGetSubMatrices">src/ksp/ksp/utils/schurm.c</A>
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