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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
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<A NAME="PCExoticSetType"><H1>PCExoticSetType</H1></A>
Sets the type of coarse grid interpolation to use
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdmda.h"
#include "petscksp.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../PC/PCExoticSetType.html#PCExoticSetType">PCExoticSetType</A>(<A HREF="../PC/PC.html#PC">PC</A> pc,<A HREF="../PC/PCExoticType.html#PCExoticType">PCExoticType</A> type)
</PRE>
Logically Collective on <A HREF="../PC/PC.html#PC">PC</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>pc </B></TD><TD>- the preconditioner context
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>type </B></TD><TD>- either <A HREF="../PC/PCExoticType.html#PCExoticType">PC_EXOTIC_FACE</A> or <A HREF="../PC/PCExoticType.html#PCExoticType">PC_EXOTIC_WIREBASKET</A> (defaults to face)
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
The face based interpolation has 1 degree of freedom per face and ignores the
edge and vertex values completely in the coarse problem. For any seven point
stencil the interpolation of a constant on all faces into the interior is that constant.
<P>
The wirebasket interpolation has 1 degree of freedom per vertex, per edge and
per face. A constant on the subdomain boundary is interpolated as that constant
in the interior of the domain.
<P>
The coarse grid matrix is obtained via the Galerkin computation A_c = R A R^T, hence
if A is nonsingular A_c is also nonsingular.
<P>
Both interpolations are suitable for only scalar problems.
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCEXOTIC.html#PCEXOTIC">PCEXOTIC</A>, <A HREF="../PC/PCExoticType.html#PCExoticType">PCExoticType</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/ksp/pc/impls/wb/wb.c.html#PCExoticSetType">src/ksp/pc/impls/wb/wb.c</A>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/ksp/pc/impls/wb/wb.c.html#PCExoticSetType_Exotic">PCExoticSetType_Exotic in src/ksp/pc/impls/wb/wb.c</A><BR>
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