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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="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 "petscis.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../IS/ISEqual.html#ISEqual">ISEqual</A>(<A HREF="../IS/IS.html#IS">IS</A> is1,<A HREF="../IS/IS.html#IS">IS</A> is2,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> *flg)
</PRE>
Collective on <A HREF="../IS/IS.html#IS">IS</A>
<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>is1, is2 </B></TD><TD>- The index sets being compared
</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>flg </B></TD><TD>- output flag, either <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> (if both index sets have the
same indices), or <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A> if the index sets differ by size
or by the set of indices)
</TD></TR></TABLE>
<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>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../IS/ISEqualUnsorted.html#ISEqualUnsorted">ISEqualUnsorted</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/vec/is/is/utils/iscomp.c.html#ISEqual">src/vec/is/is/utils/iscomp.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/mat/impls/sbaij/mpi/mpisbaij.c.html#ISEqual_private">ISEqual_private in src/mat/impls/sbaij/mpi/mpisbaij.c</A><BR>
<BR><A HREF="./index.html">Index of all IS routines</A>
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