Technical Item! was: Re: [Coin-standards] Re: SMPS reader

[Matthew Saltzman]

On Mon, 15 Apr 2002, Leonardo B. Lopes wrote:

>[...]
>
> Remembering of course that we won't be performing inner products or
> gaussian-type operations on these, but instead a lot of set unions and
> intersections (at least in SMPS). In addition, one of these will actually
> be returned to someone writing a solver or something similar. I haven't
> seen John Forrets' MPS reader. What does he use?

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.

If there are features missing from the OSI that you need, we'd like to
know about them.  This is, to my mind, one of the really useful things the
OSI can do for the community.

BTW, I have a partial implementation of an SMPS reader that I wrote about
a decade ago in C.  If it would be of any help, I'd be glad to contribute
it (though I can't support it much...).  It fed my own implementation of
the L-shaped algorithm using early versions of CPLEX and LOQO as LP
engines.  (I'm not really a stochastic programmer by trade, and I haven't
looked at it in almost that long, but I can dig it out if there's any
interest.)

-- 
		Matthew Saltzman

Clemson University Math Sciences
mjs at clemson.edu
http://www.math.clemson.edu/~mjs