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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="DMCompositeGetGlobalISs"><H1>DMCompositeGetGlobalISs</H1></A>
Gets the index sets for each composed object
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmcomposite.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../DM/DMCompositeGetGlobalISs.html#DMCompositeGetGlobalISs">DMCompositeGetGlobalISs</A>(<A HREF="../DM/DM.html#DM">DM</A> dm,<A HREF="../IS/IS.html#IS">IS</A> *is[])
</PRE>
Collective on dm
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dm </B></TD><TD>- the packer object
</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>is </B></TD><TD>- the array of index sets
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The is entries should be destroyed with <A HREF="../IS/ISDestroy.html#ISDestroy">ISDestroy</A>(), the is array should be freed with <A HREF="../Sys/PetscFree.html#PetscFree">PetscFree</A>()
<P>
These could be used to extract a subset of vector entries for a "multi-physics" preconditioner
<P>
Use <A HREF="../DM/DMCompositeGetLocalISs.html#DMCompositeGetLocalISs">DMCompositeGetLocalISs</A>() for index sets in the packed local numbering, and
<A HREF="../DM/DMCompositeGetISLocalToGlobalMappings.html#DMCompositeGetISLocalToGlobalMappings">DMCompositeGetISLocalToGlobalMappings</A>() for to map local sub-<A HREF="../DM/DM.html#DM">DM</A> (including ghost) indices to packed global
indices.
<P>
<H3><FONT COLOR="#CC3333">Fortran Notes</FONT></H3>
<P>
The output argument 'is' must be an allocated array of sufficient length, which can be learned using <A HREF="../DM/DMCompositeGetNumberDM.html#DMCompositeGetNumberDM">DMCompositeGetNumberDM</A>().
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMDestroy.html#DMDestroy">DMDestroy</A>(), <A HREF="../DM/DMCompositeAddDM.html#DMCompositeAddDM">DMCompositeAddDM</A>(), <A HREF="../DM/DMCreateGlobalVector.html#DMCreateGlobalVector">DMCreateGlobalVector</A>(),
<BR><A HREF="../DM/DMCompositeGather.html#DMCompositeGather">DMCompositeGather</A>(), <A HREF="../DM/DMCompositeCreate.html#DMCompositeCreate">DMCompositeCreate</A>(), <A HREF="../DM/DMCompositeGetAccess.html#DMCompositeGetAccess">DMCompositeGetAccess</A>(), <A HREF="../DM/DMCompositeScatter.html#DMCompositeScatter">DMCompositeScatter</A>(),
<A HREF="../DM/DMCompositeGetLocalVectors.html#DMCompositeGetLocalVectors">DMCompositeGetLocalVectors</A>(), <A HREF="../DM/DMCompositeRestoreLocalVectors.html#DMCompositeRestoreLocalVectors">DMCompositeRestoreLocalVectors</A>(),<A HREF="../DM/DMCompositeGetEntries.html#DMCompositeGetEntries">DMCompositeGetEntries</A>()
<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/composite/pack.c.html#DMCompositeGetGlobalISs">src/dm/impls/composite/pack.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/snes/tutorials/ex28.c.html">src/snes/tutorials/ex28.c.html</A><BR>
<A HREF="../../../src/snes/tutorials/ex73f90t.F90.html">src/snes/tutorials/ex73f90t.F90.html</A><BR>
<BR><A HREF="./index.html">Index of all DM routines</A>
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