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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 PETSCMAT_DLLEXPORT MatGetDiagonalBlock(Mat A,PetscTruth *iscopy,MatReuse reuse,Mat *a)
</PRE>
Not Collective
<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>reuse </B></TD><TD>- indicates you are passing in the a matrix and want it reused
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>iscopy </B></TD><TD>- indicates a copy of the diagonal matrix was created and you should use <A HREF="../Mat/MatDestroy.html#MatDestroy">MatDestroy</A>() on it
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>a </B></TD><TD>- the diagonal part (which is a SEQUENTIAL matrix)
</TD></TR></TABLE>
<P>
Notes: see the manual page for <A HREF="../Mat/MatCreateMPIAIJ.html#MatCreateMPIAIJ">MatCreateMPIAIJ</A>() for more information on the "diagonal part" of the matrix
<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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