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<A NAME="MatGetRedundantMatrix"><H1>MatGetRedundantMatrix</H1></A>
Create redundant matrices and put them into processors of subcommunicators.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatGetRedundantMatrix(Mat mat,PetscInt nsubcomm,MPI_Comm subcomm,PetscInt mlocal_red,MatReuse reuse,Mat *matredundant)
</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>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>nsubcomm </B></TD><TD>- the number of subcommunicators (= number of redundant parallel or sequential matrices)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>subcomm </B></TD><TD>- MPI communicator split from the communicator where mat resides in
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mlocal_red </B></TD><TD>- number of local rows of the redundant matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>reuse </B></TD><TD>- either MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>matredundant </B> -redundant matrix
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
MAT_REUSE_MATRIX can only be used when the nonzero structure of the
original matrix has not changed from that last call to <A HREF="../Mat/MatGetRedundantMatrix.html#MatGetRedundantMatrix">MatGetRedundantMatrix</A>().
<P>
This routine creates the duplicated matrices in subcommunicators; you should NOT create them before
calling it.
<P>
Only MPIAIJ matrix is supported.
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatDestroy.html#MatDestroy">MatDestroy</A>()
<BR><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#MatGetRedundantMatrix">src/mat/interface/matrix.c</A>
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