[petsc-users] I am wondering if there is a way to implement SPMM

[Patrick Sanan]

On Tue, Aug 04, 2015 at 03:42:14PM +0900, Cong Li wrote:
> Thanks for your reply.
> 
> I have an other question.
> I want to do SPMM several times and combine result matrices into one bigger
> matrix.
> for example
> I firstly calculate AX1=B1, AX2=B2 ...
> then I want to combine B1, B2.. to get a C, where C=[B1,B2...]
> 
> Could you please suggest a way of how to do this.
This is just linear algebra, nothing to do with PETSc specifically.
A * [X1, X2, ... ] = [AX1, AX2, ...] 
> 
> Thanks
> 
> Cong Li
> 
> On Tue, Aug 4, 2015 at 3:27 PM, Jed Brown <jed at jedbrown.org> wrote:
> 
> > Cong Li <solvercorleone at gmail.com> writes:
> >
> > > Hello,
> > >
> > > I am a PhD student using PETsc for my research.
> > > I am wondering if there is a way to implement SPMM (Sparse matrix-matrix
> > > multiplication) by using PETSc.
> >
> >
> > http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatMatMult.html
> >
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