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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.14.5 v3.14.5 docs/manualpages/IS/ISOnComm.html "><small>Report Typos and Errors</small></a></div>
<A NAME="ISOnComm"><H1>ISOnComm</H1></A>
Split a parallel <A HREF="../IS/IS.html#IS">IS</A> on subcomms (usually self) or concatenate index sets on subcomms into a parallel index set
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscis.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../IS/ISOnComm.html#ISOnComm">ISOnComm</A>(<A HREF="../IS/IS.html#IS">IS</A> is,<A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A> comm,<A HREF="../Sys/PetscCopyMode.html#PetscCopyMode">PetscCopyMode</A> mode,<A HREF="../IS/IS.html#IS">IS</A> *newis)
</PRE>
Collective on <A HREF="../IS/IS.html#IS">IS</A>
<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>is </B></TD><TD>- index set
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>comm </B></TD><TD>- communicator for new index set
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mode </B></TD><TD>- copy semantics, <A HREF="../Sys/PetscCopyMode.html#PetscCopyMode">PETSC_USE_POINTER</A> for no-copy if possible, otherwise <A HREF="../Sys/PetscCopyMode.html#PetscCopyMode">PETSC_COPY_VALUES</A>
</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>newis </B></TD><TD>- new <A HREF="../IS/IS.html#IS">IS</A> on comm
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
It is usually desirable to create a parallel <A HREF="../IS/IS.html#IS">IS</A> and look at the local part when necessary.
<P>
This function is useful if serial ISs must be created independently, or to view many
logically independent serial ISs.
<P>
The input <A HREF="../IS/IS.html#IS">IS</A> must have the same type on every process.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
ISSplit()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/vec/is/is/interface/index.c.html#ISOnComm">src/vec/is/is/interface/index.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/vec/is/is/impls/block/block.c.html#ISOnComm_Block">ISOnComm_Block in src/vec/is/is/impls/block/block.c</A><BR>
<A HREF="../../../src/vec/is/is/impls/general/general.c.html#ISOnComm_General">ISOnComm_General in src/vec/is/is/impls/general/general.c</A><BR>
<A HREF="../../../src/vec/is/is/impls/stride/stride.c.html#ISOnComm_Stride">ISOnComm_Stride in src/vec/is/is/impls/stride/stride.c</A><BR>
<BR><A HREF="./index.html">Index of all IS routines</A>
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