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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="ISDifference"><H1>ISDifference</H1></A>
Computes the difference between two index sets.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscis.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../IS/ISDifference.html#ISDifference">ISDifference</A>(<A HREF="../IS/IS.html#IS">IS</A> is1,<A HREF="../IS/IS.html#IS">IS</A> is2,<A HREF="../IS/IS.html#IS">IS</A> *isout)
</PRE>
Collective on <A HREF="../IS/IS.html#IS">IS</A>
<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>- first index, to have items removed from it
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>is2 </B></TD><TD>- index values to be removed
</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>isout </B></TD><TD>- is1 - is2
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Negative values are removed from the lists. is2 may have values
that are not in is1. This requires O(imax-imin) memory and O(imax-imin)
work, where imin and imax are the bounds on the indices in is1.
<P>
If is2 is NULL, the result is the same as for an empty <A HREF="../IS/IS.html#IS">IS</A>, i.e., a duplicate of is1.
<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/ISSum.html#ISSum">ISSum</A>(), <A HREF="../IS/ISExpand.html#ISExpand">ISExpand</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/isdiff.c.html#ISDifference">src/vec/is/is/utils/isdiff.c</A>
<BR><A HREF="./index.html">Index of all IS routines</A>
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