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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="MatPtAPSymbolic"><H1>MatPtAPSymbolic</H1></A>
Creates the (i,j) structure of the matrix product C = P^T * A * P
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
PetscErrorCode MatPtAPSymbolic(Mat A,Mat P,PetscReal fill,Mat *C)
</PRE>
Neighbor-wise 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>A </B></TD><TD>- the matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>P </B></TD><TD>- the projection matrix
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>C </B> -the (i,j) structure of the product matrix
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
C will be created and must be destroyed by the user with <A HREF="../Mat/MatDestroy.html#MatDestroy">MatDestroy</A>().
<P>
This routine is currently only implemented for pairs of SeqAIJ matrices and classes
which inherit from SeqAIJ. C will be of type <A HREF="../Mat/MATSEQAIJ.html#MATSEQAIJ">MATSEQAIJ</A>. The product is computed using
this (i,j) structure by calling <A HREF="../Mat/MatPtAPNumeric.html#MatPtAPNumeric">MatPtAPNumeric</A>().
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatPtAP.html#MatPtAP">MatPtAP</A>(), <A HREF="../Mat/MatPtAPNumeric.html#MatPtAPNumeric">MatPtAPNumeric</A>(), <A HREF="../Mat/MatMatMultSymbolic.html#MatMatMultSymbolic">MatMatMultSymbolic</A>()
<BR><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#MatPtAPSymbolic">src/mat/interface/matrix.c</A>
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