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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="DMPlexSetAnchors"><H1>DMPlexSetAnchors</H1></A>
Set the layout of the local anchor (point-to-point) constraints. Unlike boundary conditions, when a point's degrees of freedom in a section are constrained to an outside value, the anchor constraints set a point's degrees of freedom to be a linear combination of other points' degrees of freedom.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmplex.h"
PetscErrorCode DMPlexSetAnchors(DM dm, PetscSection anchorSection, IS anchorIS)
</PRE>
After specifying the layout of constraints with <A HREF="../DM/DMPlexSetAnchors.html#DMPlexSetAnchors">DMPlexSetAnchors</A>(), one specifies the constraints by calling
DMGetConstraints() and filling in the entries in the constraint matrix.
<P>
collective on dm
<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>dm </B></TD><TD>- The DMPlex object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>anchorSection </B></TD><TD>- The section that describes the mapping from constrained points to the anchor points listed in anchorIS. Must have a local communicator (<A HREF="../Sys/PETSC_COMM_SELF.html#PETSC_COMM_SELF">PETSC_COMM_SELF</A> or derivative).
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>anchorIS </B></TD><TD>- The list of all anchor points. Must have a local communicator (<A HREF="../Sys/PETSC_COMM_SELF.html#PETSC_COMM_SELF">PETSC_COMM_SELF</A> or derivative).
</TD></TR></TABLE>
<P>
The reference counts of anchorSection and anchorIS are incremented.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMPlexGetAnchors.html#DMPlexGetAnchors">DMPlexGetAnchors</A>(), DMGetConstraints(), DMSetConstraints()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/impls/plex/plex.c.html#DMPlexSetAnchors">src/dm/impls/plex/plex.c</A>
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