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On 8/05/2009, at 2:56 AM, steve donovan wrote:

Hi all,

Hi Steve,

Thanks for that.

Rima, my as-yet-unreleased-why-did-I-decide-to-rewrite-when-it-was- nearly-working binding to MP solvers handles symbolic expressions to a limited extent. Rather than differentiation, the goal is to simplify expressions into linear equations - as you'd expect for LP - but there's some similarity.

I think I'll delay things further and make a few changes to pinch some of your good ideas and so that it matches a little better what you've done, and I'd be keen to swap notes once I've got something out there to look at.

I've had a quick look at your code, but I can't work this one out: what's the result of differentiating 3*x^2 + 5*x^2? That is, does it gather terms that aren't exactly alike?