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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="MatMatMultSymbolic"><H1>MatMatMultSymbolic</H1></A>
Performs construction, preallocation, and computes the ij structure of the matrix-matrix product C=A*B. Call this routine before calling <A HREF="../Mat/MatMatMultNumeric.html#MatMatMultNumeric">MatMatMultNumeric</A>().
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscmat.h"
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Mat/MatMatMultSymbolic.html#MatMatMultSymbolic">MatMatMultSymbolic</A>(<A HREF="../Mat/Mat.html#Mat">Mat</A> A,<A HREF="../Mat/Mat.html#Mat">Mat</A> B,<A HREF="../Sys/PetscReal.html#PetscReal">PetscReal</A> fill,<A HREF="../Mat/Mat.html#Mat">Mat</A> *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 left matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>B </B></TD><TD>- the right matrix
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>fill </B></TD><TD>- expected fill as ratio of nnz(C)/(nnz(A) + nnz(B)), use <A HREF="../Sys/PETSC_DEFAULT.html#PETSC_DEFAULT">PETSC_DEFAULT</A> if you do not have a good estimate,
if C is a dense matrix this is irrelevent
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>C </B> -the product matrix
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Unless scall is <A HREF="../Mat/MatReuse.html#MatReuse">MAT_REUSE_MATRIX</A> C will be created.
<P>
To determine the correct fill value, run with -info and search for the string "Fill ratio" to see the value
actually needed.
<P>
This routine is currently implemented for
- pairs of AIJ matrices and classes which inherit from AIJ, C will be of type AIJ
- pairs of AIJ (A) and Dense (B) matrix, C will be of type Dense.
- pairs of Dense (A) and AIJ (B) matrix, C will be of type Dense.
<P>
<P>
Developers Note: There are ways to estimate the number of nonzeros in the resulting product, see for example, http://arxiv.org/abs/1006.4173
We should incorporate them into PETSc.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Mat/MatMatMult.html#MatMatMult">MatMatMult</A>(), <A HREF="../Mat/MatMatMultNumeric.html#MatMatMultNumeric">MatMatMultNumeric</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/mat/interface/matrix.c.html#MatMatMultSymbolic">src/mat/interface/matrix.c</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/tao/pde_constrained/examples/tutorials/elliptic.c.html">src/tao/pde_constrained/examples/tutorials/elliptic.c.html</A><BR>
<A HREF="../../../src/tao/pde_constrained/examples/tutorials/parabolic.c.html">src/tao/pde_constrained/examples/tutorials/parabolic.c.html</A><BR>
<P><H3><FONT COLOR="CC3333">Implementations</FONT></H3><A HREF="../../../src/mat/impls/aij/mpi/mpiaij.c.html#MatMatMultSymbolic_MPIDense_MPIAIJ">MatMatMultSymbolic_MPIDense_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c</A><BR>
<A HREF="../../../src/mat/impls/aij/mpi/mpimatmatmult.c.html#MatMatMultSymbolic_MPIAIJ_MPIAIJ_nonscalable">MatMatMultSymbolic_MPIAIJ_MPIAIJ_nonscalable in src/mat/impls/aij/mpi/mpimatmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/mpi/mpimatmatmult.c.html#MatMatMultSymbolic_MPIAIJ_MPIDense">MatMatMultSymbolic_MPIAIJ_MPIDense in src/mat/impls/aij/mpi/mpimatmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/mpi/mpimatmatmult.c.html#MatMatMultSymbolic_MPIAIJ_MPIAIJ">MatMatMultSymbolic_MPIAIJ_MPIAIJ in src/mat/impls/aij/mpi/mpimatmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/mpi/mpimatmatmult.c.html#MatMatMultSymbolic_MPIAIJ_MPIAIJ_seqMPI">MatMatMultSymbolic_MPIAIJ_MPIAIJ_seqMPI in src/mat/impls/aij/mpi/mpimatmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/aij.c.html#MatMatMultSymbolic_SeqDense_SeqAIJ">MatMatMultSymbolic_SeqDense_SeqAIJ in src/mat/impls/aij/seq/aij.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/matmatmult.c.html#MatMatMultSymbolic_SeqAIJ_SeqAIJ_LLCondensed">MatMatMultSymbolic_SeqAIJ_SeqAIJ_LLCondensed in src/mat/impls/aij/seq/matmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/matmatmult.c.html#MatMatMultSymbolic_SeqAIJ_SeqAIJ_Scalable_fast">MatMatMultSymbolic_SeqAIJ_SeqAIJ_Scalable_fast in src/mat/impls/aij/seq/matmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/matmatmult.c.html#MatMatMultSymbolic_SeqAIJ_SeqAIJ_Scalable">MatMatMultSymbolic_SeqAIJ_SeqAIJ_Scalable in src/mat/impls/aij/seq/matmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/matmatmult.c.html#MatMatMultSymbolic_SeqAIJ_SeqAIJ_Heap">MatMatMultSymbolic_SeqAIJ_SeqAIJ_Heap in src/mat/impls/aij/seq/matmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/matmatmult.c.html#MatMatMultSymbolic_SeqAIJ_SeqAIJ_BTHeap">MatMatMultSymbolic_SeqAIJ_SeqAIJ_BTHeap in src/mat/impls/aij/seq/matmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/matmatmult.c.html#MatMatMultSymbolic_SeqAIJ_SeqAIJ">MatMatMultSymbolic_SeqAIJ_SeqAIJ in src/mat/impls/aij/seq/matmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/aij/seq/matmatmult.c.html#MatMatMultSymbolic_SeqAIJ_SeqDense">MatMatMultSymbolic_SeqAIJ_SeqDense in src/mat/impls/aij/seq/matmatmult.c</A><BR>
<A HREF="../../../src/mat/impls/dense/mpi/mpidense.c.html#MatMatMultSymbolic_MPIDense_MPIDense">MatMatMultSymbolic_MPIDense_MPIDense in src/mat/impls/dense/mpi/mpidense.c</A><BR>
<A HREF="../../../src/mat/impls/dense/seq/dense.c.html#MatMatMultSymbolic_SeqDense_SeqDense">MatMatMultSymbolic_SeqDense_SeqDense in src/mat/impls/dense/seq/dense.c</A><BR>
<A HREF="../../../src/mat/impls/elemental/matelem.cxx.html#MatMatMultSymbolic_Elemental">MatMatMultSymbolic_Elemental in src/mat/impls/elemental/matelem.cxx</A><BR>
<A HREF="../../../src/mat/impls/hypre/mhypre.c.html#MatMatMultSymbolic_AIJ_AIJ_wHYPRE">MatMatMultSymbolic_AIJ_AIJ_wHYPRE in src/mat/impls/hypre/mhypre.c</A><BR>
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