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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</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-3.7.5 v3.7.5 docs/manualpages/DM/DMCompositeGetLocalISs.html "><small>Report Typos and Errors</small></a></div>
<A NAME="DMCompositeGetLocalISs"><H1>DMCompositeGetLocalISs</H1></A>
Gets index sets for each component of a composite local vector
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmcomposite.h"
PetscErrorCode DMCompositeGetLocalISs(DM dm,IS **is)
</PRE>
Not Collective
<P>
<H3><FONT COLOR="#CC3333">Input Arguments</FONT></H3>
<DT><B>dm </B> -composite <A HREF="../DM/DM.html#DM">DM</A>
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Arguments</FONT></H3>
<DT><B>is </B> -array of serial index sets for each each component of the DMComposite
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
At present, a composite local vector does not normally exist. This function is used to provide index sets for
<A HREF="../Mat/MatGetLocalSubMatrix.html#MatGetLocalSubMatrix">MatGetLocalSubMatrix</A>(). In the future, the scatters for each entry in the DMComposite may be be merged into a single
scatter to a composite local vector. The user should not typically need to know which is being done.
<P>
To get the composite global indices at all local points (including ghosts), use <A HREF="../DM/DMCompositeGetISLocalToGlobalMappings.html#DMCompositeGetISLocalToGlobalMappings">DMCompositeGetISLocalToGlobalMappings</A>().
<P>
To get index sets for pieces of the composite global vector, use <A HREF="../DM/DMCompositeGetGlobalISs.html#DMCompositeGetGlobalISs">DMCompositeGetGlobalISs</A>().
<P>
Each returned <A HREF="../IS/IS.html#IS">IS</A> should be destroyed with <A HREF="../IS/ISDestroy.html#ISDestroy">ISDestroy</A>(), the array should be freed with <A HREF="../Sys/PetscFree.html#PetscFree">PetscFree</A>().
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMCompositeGetGlobalISs.html#DMCompositeGetGlobalISs">DMCompositeGetGlobalISs</A>(), <A HREF="../DM/DMCompositeGetISLocalToGlobalMappings.html#DMCompositeGetISLocalToGlobalMappings">DMCompositeGetISLocalToGlobalMappings</A>(), <A HREF="../Mat/MatGetLocalSubMatrix.html#MatGetLocalSubMatrix">MatGetLocalSubMatrix</A>(), <A HREF="../Mat/MatCreateLocalRef.html#MatCreateLocalRef">MatCreateLocalRef</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/impls/composite/pack.c.html#DMCompositeGetLocalISs">src/dm/impls/composite/pack.c</A>
<BR><A HREF="./index.html">Index of all DM routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/snes/examples/tutorials/ex28.c.html">src/snes/examples/tutorials/ex28.c.html</A><BR>
<A HREF="../../../src/ts/examples/tutorials/ex14.c.html">src/ts/examples/tutorials/ex14.c.html</A><BR>
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