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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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<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"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatMPIAdjCreateNonemptySubcommMat.html#MatMPIAdjCreateNonemptySubcommMat">MatMPIAdjCreateNonemptySubcommMat</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> A,<A HREF="../Mat/Mat.html#Mat">Mat</A> *B)
</PRE>
Collective
<P>
<H3><FONT COLOR="#CC3333">Input Arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>A </B></TD><TD>- original MPIAdj matrix
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD>- matrix on subcommunicator, NULL on ranks that owned zero rows of A
</TD></TR></TABLE>
<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></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/mat/impls/adj/mpi/mpiadj.c.html#MatMPIAdjCreateNonemptySubcommMat">src/mat/impls/adj/mpi/mpiadj.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/mat/impls/adj/mpi/mpiadj.c.html#MatMPIAdjCreateNonemptySubcommMat_MPIAdj">MatMPIAdjCreateNonemptySubcommMat_MPIAdj in src/mat/impls/adj/mpi/mpiadj.c</A><BR>
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