Hi all, I'm glad to inform you about new OpenOpt Suite release 0.39 (2012-June-15): interalg: add categorical variables and general logical constraints, many other improvements Some improvements for automatic differentiation DerApproximator and some OpenOpt / FuncDesigner functionality now works with PyPy New solver lsmr for dense / sparse LLSP oovar constructors now can handle parameters lb and ub, e.g. a = oovar('a', lb=-1, ub=[1,2,3]) (this oovar should have size 3) or x = oovars(10, lb=-1, ub=1) New FuncDesigner function hstack, similar syntax to numpy.hstack, e.g. f = hstack((a,b,c,d)) Some bugfixes I have some progress toward solving in FuncDesigner linear DAE (differential algebraic equations, example) and Stochastic Opimization (example), but this is too premature yet to be released, there is 60-70% probability it will be properly implemented in next OpenOpt release. In our website you could vote for most required OpenOpt Suite development direction(s). -------------------- Regards, D. http://openopt.org/Dmitrey