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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="MatGetDiagonalBlock"><H1>MatGetDiagonalBlock</H1></A>
Returns the part of the matrix associated with the on-process coupling
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatGetDiagonalBlock(Mat A,Mat *a)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<DT><B>A </B> -the matrix
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>a </B> -the diagonal part (which is a SEQUENTIAL matrix)
<br>
<P>
Notes: see the manual page for <A HREF="../Mat/MatCreateAIJ.html#MatCreateAIJ">MatCreateAIJ</A>() for more information on the "diagonal part" of the matrix.
Use caution, as the reference count on the returned matrix is not incremented and it is used as
part of the containing MPI <A HREF="../Mat/Mat.html#Mat">Mat</A>'s normal operation.
<P>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matrix.c.html#MatGetDiagonalBlock">src/mat/interface/matrix.c</A>
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