HaloO, Doug McNutt wrote:
Don't allow it to become= f(-$x); ## wrong!
Unless of course f does Linear, then you can factor out or in the multiplication with -1 at will. So linearity of operators and functions is a very interesting property for optimizers. Regards, TSa. -- The Angel of Geometry and the Devil of Algebra fight for the soul of any mathematical being. -- Attributed to Hermann Weyl
