Re: [Help-glpk] Odd/even variable constraint?

[Axel Simon]

On Wed, 2008-04-02 at 18:01 +0400, Rory Winston wrote:
> Hi
> 
> Does anyone know how I can express a constraint that a variable must be odd
> or even, i.e. in the form 2*n-1 or 2*n + 1? I am trying to write a mathprog
> script to find pythagorean triples subject to certain constraints, and i
> would like to express some conditions on my variables, namely, that one must
> be an odd integer, and the other must be an even integer.

I suppose the simplest way is to add 2*y=n to the constraint system (if
n is supposed to be even) and solve the problem as integer problem.

Axel.