[Coin-standards] Let's see some code! (was:) Re: Technical Item! was: Re: [Coin-standards] Re: SMPS reader

[Leonardo B. Lopes]

Great! Actually, I implemented my own sparse matrices to do two operations
that we need for reading and writing SMPS. I can add the operations to one
of the Osi representations this week. I haven't seen the operations before
in the SM books I looked at, so I gave them original names. If you have
seen them and know what the proper names should be, please let me know.
The operations are:

Sparse Matrix OR:

C = A || B if:
c_ij = a_ij forall ij in A;
c_ij = b_ij forall ij in B \ A;
c_ij undef ow.

and 

Sparse Matrix Remainder:

A = C % B if
C = A || B and 
if C' = A || B then card(def(C)) <= card(def(C'))

Leo.

On Mon, 15 Apr 2002, Matthew Saltzman wrote:

> On Mon, 15 Apr 2002, Leonardo B. Lopes wrote:
> 
> > On Mon, 15 Apr 2002, Matthew Saltzman wrote:
> >
> > >
> > > I haven't read John's code yet, but since it's in the COIN OSI, it's a
> > > good bet that he uses the COIN OSI internal representation.  If you want
> > > to write a reference implementation, I think that would be a good target.
> > >
> >
> > So is there a coin sparse matrix class? I couldn't find it on the web...
> 
> OsiPackedMatrix.  We also havea a couple of sparse vector classes
> (OsiPackedVector, OsiShallowPackedVector, and OsiIndexedVector).
> 
> Recently added: OsiFactorization.
> 
> -- 
> 		Matthew Saltzman
> 
> Clemson University Math Sciences
> mjs at clemson.edu
> http://www.math.clemson.edu/~mjs
> 
> 

========================================================================
Leonardo B. Lopes                                       leo at iems.nwu.edu 
Ph.D. Student                                              (847)491-8470
IEMS - Northwestern University              http://www.iems.nwu.edu/~leo