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)
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```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:
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> 1) define a list of parameters: Par = {a->1, b->3, etc};
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> 2) define two functions: f1: v1=express./Par f2: v2=express./Par
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> After this the expression are numerical except for the variables:
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> V1=f(e1,x) and V2=f(e2,x)
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> The objective function to be maximized is V1/(e1+e2) I defined the constraint as constr=V1-V2;
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> then I used the Nmaximize:
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>  NMaximize[{objopt > 0, constr == 0}, {e1, e2, x}, Method -> NelderMead]
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> I obtained the following error:
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> NMaximize::bcons: "The following constraints are not valid: "expression".  Constraints should be equalities, inequalities, or domain specifications involving the variables"
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> 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?
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> Thank you
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> Alex

I solved the many errors I made. I am a real noob with mathematica. Thank you

```

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