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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></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"
PetscErrorCode ISOnComm(IS is,MPI_Comm comm,PetscCopyMode mode,IS *newis)
</PRE>
Collective on <A HREF="../IS/IS.html#IS">IS</A> and comm
<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, PETSC_USE_POINTER for no-copy if possible, otherwise PETSC_COPY_VALUES
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Arguments</FONT></H3>
<DT><B>newis </B> -new <A HREF="../IS/IS.html#IS">IS</A> on comm
<br>
<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><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/is/is/interface/index.c.html#ISOnComm">src/vec/is/is/interface/index.c</A>
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