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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="ISSum"><H1>ISSum</H1></A>
Computes the sum (union) of two index sets.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscis.h"
PetscErrorCode ISSum(IS is1,IS is2,IS *is3)
</PRE>
Only sequential version (at the moment)
<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>is1 </B></TD><TD>- index set to be extended
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>is2 </B></TD><TD>- index values to be added
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>is3 </B> -the sum; this can not be is1 or is2
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
If n1 and n2 are the sizes of the sets, this takes O(n1+n2) time;
<P>
Both index sets need to be sorted on input.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../IS/ISDestroy.html#ISDestroy">ISDestroy</A>(), <A HREF="../IS/ISView.html#ISView">ISView</A>(), <A HREF="../IS/ISDifference.html#ISDifference">ISDifference</A>(), <A HREF="../IS/ISExpand.html#ISExpand">ISExpand</A>()
<BR>
<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/is/utils/isdiff.c.html#ISSum">src/vec/is/is/utils/isdiff.c</A>
<BR><A HREF="./index.html">Index of all IS routines</A>
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