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<A NAME="DMGetInterpolation"><H1>DMGetInterpolation</H1></A>
Gets interpolation matrix between two DMDA or DMComposite objects
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscdm.h"
PetscErrorCode DMGetInterpolation(DM dm1,DM dm2,Mat *mat,Vec *vec)
</PRE>
Collective on DM
<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>dm1 </B></TD><TD>- the DM object
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>dm2 </B></TD><TD>- the second, finer DM object
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mat </B></TD><TD>- the interpolation
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>vec </B></TD><TD>- the scaling (optional)
</TD></TR></TABLE>
<P>
<P>
Notes: For DMDA objects this only works for "uniform refinement", that is the refined mesh was obtained <A HREF="../DM/DMRefine.html#DMRefine">DMRefine</A>() or the coarse mesh was obtained by
<A HREF="../DM/DMCoarsen.html#DMCoarsen">DMCoarsen</A>(). The coordinates set into the DMDA are completely ignored in computing the interpolation.
<P>
For DMDA objects you can use this interpolation (more precisely the interpolation from the <A HREF="../DM/DMDAGetCoordinateDA.html#DMDAGetCoordinateDA">DMDAGetCoordinateDA</A>()) to interpolate the mesh coordinate vectors
EXCEPT in the periodic case where it does not make sense since the coordinate vectors are not periodic.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DM/DMDestroy.html#DMDestroy">DMDestroy</A>(), <A HREF="../DM/DMView.html#DMView">DMView</A>(), <A HREF="../DM/DMCreateGlobalVector.html#DMCreateGlobalVector">DMCreateGlobalVector</A>(), <A HREF="../DM/DMGetColoring.html#DMGetColoring">DMGetColoring</A>(), <A HREF="../DM/DMGetMatrix.html#DMGetMatrix">DMGetMatrix</A>(), <A HREF="../DM/DMRefine.html#DMRefine">DMRefine</A>(), <A HREF="../DM/DMCoarsen.html#DMCoarsen">DMCoarsen</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/interface/dm.c.html#DMGetInterpolation">src/dm/interface/dm.c</A>
<BR><A HREF="./index.html">Index of all DM routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/dm/examples/tutorials/ex3.c.html">src/dm/examples/tutorials/ex3.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex42.c.html">src/ksp/ksp/examples/tutorials/ex42.c.html</A><BR>
<A HREF="../../../src/snes/examples/tutorials/ex48.c.html">src/snes/examples/tutorials/ex48.c.html</A><BR>
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