Re: [Haskell-cafe] Linear programming in Haskell

But, isn't it the case that you can transform any linear inequality into a linear equality and a slack (or excess) variable? That's actually what you *need to do* to turn the problem into the canonical form, so that simplex can handle it.

Yes. The simplex is usually implemented in this form. If you just want to play around with linear programming in Haskell, you could try write an FFI wrapper aruond SCIP (http://scip.zib.de/). (Though the licence of scip is probably not what you want. But there are other solvers available, too.) The domain specific language (and compiler of the same name) ZIMPL may be worth a look for linear programming. (http://zimpl.zib.de/)