Re: Constraint definition is not valid: WHY?

*To*: mathgroup at smc.vnet.net*Subject*: [mg131383] Re: Constraint definition is not valid: WHY?*From*: Alessandro Bolli <aless.bolli at gmail.com>*Date*: Tue, 2 Jul 2013 00:48:22 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net*References*: <kqrite$4a6$1@smc.vnet.net>

Il giorno luned=EC 1 luglio 2013 11:42:06 UTC+2, Alessandro Bolli ha scritto: > I am tring to use Nmaximize in Mathematica This is How I proceeded: > > > > 1) define a list of parameters: Par = {a->1, b->3, etc}; > > > > 2) define two functions: f1: v1=express./Par f2: v2=express./Par > > > > After this the expression are numerical except for the variables: > > > > V1=f(e1,x) and V2=f(e2,x) > > The objective function to be maximized is V1/(e1+e2) I defined the constraint as constr=V1-V2; > > > > then I used the Nmaximize: > > > > NMaximize[{objopt > 0, constr == 0}, {e1, e2, x}, Method -> NelderMead] > > I obtained the following error: > > > > NMaximize::bcons: "The following constraints are not valid: "expression". Constraints should be equalities, inequalities, or domain specifications involving the variables" > > > > I checked that only those variables are present in the constraint and objective function (other are numerical parameters) I do not understand why this error appears can someone help me? > > > > Thank you > > > > Alex I solved the many errors I made. I am a real noob with mathematica. Thank you