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<A NAME="MatInterpolateAdd"><H1>MatInterpolateAdd</H1></A>
w = y + A*x or A'*x depending on the shape of the matrix
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatInterpolateAdd(Mat A,Vec x,Vec y,Vec w)
</PRE>
Collective on <A HREF="../Mat/Mat.html#Mat">Mat</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>mat </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>x,y </B></TD><TD>- the vectors
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>w </B></TD><TD>- where the result is stored
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">C++ variants</FONT></H3><TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD>  MatInterpolateAdd(Mat A,Vec x,Vec y)<TD WIDTH=20></TD><TD>-></TD><TD WIDTH=20></TD><TD>MatInterpolateAdd(A,x,y,y)</TR></TD>
</TABLE>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
w may be the same vector as y.
<P>
This allows one to use either the restriction or interpolation (its transpose)
matrix to do the interpolation
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatMultAdd.html#MatMultAdd">MatMultAdd</A>(), <A HREF="../Mat/MatMultTransposeAdd.html#MatMultTransposeAdd">MatMultTransposeAdd</A>(), <A HREF="../Mat/MatRestrict.html#MatRestrict">MatRestrict</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/mat/interface/matrix.c.html#MatInterpolateAdd">src/mat/interface/matrix.c</A>
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