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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PCGASMCreateLocalSubdomains"><H1>PCGASMCreateLocalSubdomains</H1></A>
Creates n local index sets for the overlapping Schwarz preconditioner for a any problem based on its matrix.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscpc.h"
PetscErrorCode PCGASMCreateLocalSubdomains(Mat A, PetscInt overlap, PetscInt n, IS *iis[], IS *ois[])
</PRE>
Collective
<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>A </B></TD><TD>- The global matrix operator
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>overlap </B></TD><TD>- amount of overlap in outer subdomains
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>n </B></TD><TD>- the number of local subdomains
</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>iis </B></TD><TD>- the array of index sets defining the local inner subdomains (on which the correction is applied)
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>ois </B></TD><TD>- the array of index sets defining the local outer subdomains (on which the residual is computed)
</TD></TR></TABLE>
<P>
<P>
Note: this generates n nonoverlapping local inner subdomains on <A HREF="../Sys/PETSC_COMM_SELF.html#PETSC_COMM_SELF">PETSC_COMM_SELF</A>;
<A HREF="../PC/PCGASM.html#PCGASM">PCGASM</A> will generate the overlap from these if you use them in <A HREF="../PC/PCGASMSetSubdomains.html#PCGASMSetSubdomains">PCGASMSetSubdomains</A>() and set a
nonzero overlap with <A HREF="../PC/PCGASMSetOverlap.html#PCGASMSetOverlap">PCGASMSetOverlap</A>()
<P>
In the Fortran version you must provide the array outis[] already allocated of length n.
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
<A HREF="../PC/PC.html#PC">PC</A>, GASM, additive Schwarz, create, subdomains, unstructured grid
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCGASMSetSubdomains.html#PCGASMSetSubdomains">PCGASMSetSubdomains</A>(), <A HREF="../PC/PCGASMDestroySubdomains.html#PCGASMDestroySubdomains">PCGASMDestroySubdomains</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/gasm/gasm.c.html#PCGASMCreateLocalSubdomains">src/ksp/pc/impls/gasm/gasm.c</A>
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