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<A NAME="ISEqual"><H1>ISEqual</H1></A>
Compares if two index sets have the same set of indices.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsys.h"
#include "petscis.h"
int ISEqual(IS is1,IS is2,PetscTruth *flg)
</PRE>
Collective on <A HREF="../IS/IS.html#IS">IS</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<DT><B>is1, is2 </B> -The index sets being compared
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>flg </B> -output flag, either PETSC_TRUE (if both index sets have the
same indices), or PETSC_FALSE if the index sets differ by <A HREF="../Sys/size.html#size">size</A>
or by the set of indices)
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
This routine sorts the contents of the index sets before
the comparision is made, so the order of the indices on a processor is immaterial.
<P>
Each processor has to have the same indices in the two sets, for example,
<pre>
Processor
</pre>
<pre>
0 1
</pre>
<pre>
is1 = {0, 1} {2, 3}
</pre>
<pre>
is2 = {2, 3} {0, 1}
</pre>
will return false.
<P>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/is/utils/iscomp.c.html#ISEqual">src/vec/is/utils/iscomp.c</A>
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