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<A NAME="DAGetInterpolation"><H1>DAGetInterpolation</H1></A>
Gets an interpolation matrix that maps between grids associated with two DAs.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscda.h"
PetscErrorCode PETSCDM_DLLEXPORT DAGetInterpolation(DA dac,DA daf,Mat *A,Vec *scale)
</PRE>
Collective on <A HREF="../DA/DA.html#DA">DA</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>dac </B></TD><TD>- the coarse grid <A HREF="../DA/DA.html#DA">DA</A>
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>daf </B></TD><TD>- the fine grid <A HREF="../DA/DA.html#DA">DA</A>
</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>A </B></TD><TD>- the interpolation matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>scale </B></TD><TD>- a scaling vector used to scale the coarse grid restricted vector before applying the
grid function or grid Jacobian to it.
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Keywords</FONT></H3>
interpolation, restriction, multigrid
<BR>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../DA/DARefine.html#DARefine">DARefine</A>(), <A HREF="../DA/DAGetInjection.html#DAGetInjection">DAGetInjection</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/dm/da/src/dainterp.c.html#DAGetInterpolation">src/dm/da/src/dainterp.c</A>
<BR><A HREF="./index.html">Index of all DA 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/da/examples/tutorials/ex3.c.html">src/dm/da/examples/tutorials/ex3.c.html</A><BR>
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