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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="ISEmbed"><H1>ISEmbed</H1></A>
embed <A HREF="../IS/IS.html#IS">IS</A> a into <A HREF="../IS/IS.html#IS">IS</A> b by finding the locations in b that have the same indices as in a. If c is the <A HREF="../IS/IS.html#IS">IS</A> of these locations, we have a = b*c, regarded as a composition of the corresponding ISLocalToGlobalMaps.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscis.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../IS/ISEmbed.html#ISEmbed">ISEmbed</A>(<A HREF="../IS/IS.html#IS">IS</A> a, <A HREF="../IS/IS.html#IS">IS</A> b, <A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> drop, <A HREF="../IS/IS.html#IS">IS</A> *c)
</PRE>
Not collective.
<P>
<H3><FONT COLOR="#CC3333">Input arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>a </B></TD><TD>- <A HREF="../IS/IS.html#IS">IS</A> to embed
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>b </B></TD><TD>- <A HREF="../IS/IS.html#IS">IS</A> to embed into
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>drop </B></TD><TD>- flag indicating whether to drop a's indices that are not in b.
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output arguments</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>c </B></TD><TD>- local embedding indices
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
If some of a's global indices are not among b's indices the embedding is impossible. The local indices of a
corresponding to these global indices are either mapped to -1 (if !drop) or are omitted (if drop). In the former
case the size of c is that same as that of a, in the latter case c's size may be smaller.
<P>
The resulting <A HREF="../IS/IS.html#IS">IS</A> is sequential, since the index substition it encodes is purely local.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../IS/ISLocalToGlobalMapping.html#ISLocalToGlobalMapping">ISLocalToGlobalMapping</A>
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>advanced<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/vec/is/is/utils/isdiff.c.html#ISEmbed">src/vec/is/is/utils/isdiff.c</A>
<BR><A HREF="./index.html">Index of all IS routines</A>
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