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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="DMDAGetProcessorSubsets"><H1>DMDAGetProcessorSubsets</H1></A>
Returns communicators consisting only of the processors in a <A HREF="../DMDA/DMDA.html#DMDA">DMDA</A> adjacent in a particular dimension, corresponding to a logical plane in a 3D grid or a line in a 2D grid.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmda.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DMDA/DMDAGetProcessorSubsets.html#DMDAGetProcessorSubsets">DMDAGetProcessorSubsets</A>(<A HREF="../DM/DM.html#DM">DM</A> da, <A HREF="../DM/DMDirection.html#DMDirection">DMDirection</A> dir, <A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A> *subcomm)
</PRE>
Collective on da
<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>da </B></TD><TD>- the distributed array
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dir </B></TD><TD>- Cartesian direction, either <A HREF="../DM/DMDirection.html#DMDirection">DM_X</A>, <A HREF="../DM/DMDirection.html#DMDirection">DM_Y</A>, or <A HREF="../DM/DMDirection.html#DMDirection">DM_Z</A>
</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>subcomm </B></TD><TD>- new communicator
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
This routine is useful for distributing one-dimensional data in a tensor product grid.
<P>
After use, comm should be freed with MPI_Comm_free()
<P>
Not supported from Fortran
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/dm/impls/da/dasub.c.html#DMDAGetProcessorSubsets">src/dm/impls/da/dasub.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/dm/tutorials/ex51.c.html">src/dm/tutorials/ex51.c.html</A><BR>
<BR><A HREF="./index.html">Index of all DMDA routines</A>
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