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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="MatMPIAdjCreateNonemptySubcommMat"><H1>MatMPIAdjCreateNonemptySubcommMat</H1></A>
create the same MPIAdj matrix on a subcommunicator containing only processes owning a positive number of rows
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatMPIAdjCreateNonemptySubcommMat(Mat A,Mat *B)
</PRE>
Collective
<P>
<H3><FONT COLOR="#CC3333">Input Arguments</FONT></H3>
<DT><B>A </B> -original MPIAdj matrix
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Arguments</FONT></H3>
<DT><B>B </B> -matrix on subcommunicator, NULL on ranks that owned zero rows of A
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
This function is mostly useful for internal use by mesh partitioning packages that require that every process owns at least one row.
<P>
The matrix B should be destroyed with <A HREF="../Mat/MatDestroy.html#MatDestroy">MatDestroy</A>(). The arrays are not copied, so B should be destroyed before A is destroyed.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatCreateMPIAdj.html#MatCreateMPIAdj">MatCreateMPIAdj</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/impls/adj/mpi/mpiadj.c.html#MatMPIAdjCreateNonemptySubcommMat">src/mat/impls/adj/mpi/mpiadj.c</A>
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