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Re: Minimization problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg132356] Re: Minimization problem
  • From: "giovanni r." <g.resta at iit.cnr.it>
  • Date: Wed, 19 Feb 2014 02:01:11 -0500 (EST)
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On Tuesday, February 18, 2014 4:42:37 AM UTC+1, PAR123 wrote:
> I'm trying to minimize f[{h1,h2,h3,h4}] subject to constraints that all h's lie between 0.1 and 1. Trying to use NMinimize:
> 
> NMinimize[{f[{h1, h2, h3, h4}], {h1 > 0.1, h1 <= 1.0, h2 > 0.1, 
> 
>    h2 <= 1.0, h3 > 0.1, h3 <= 1.0, h4 > 0.1, h4 <= 1.0}}, {h1, h2, h3,
> 
>    h4}]
> 
> 
> 
> I keep getting errors that indicate FindMinimum is attempting to call f[] with symbolic h's, not numbers. f[] will return a number if the inputs are numbers, but if they are symbols, its not going to happen. Is there a simple thing I am doing wrong?

You should restrict evaluation to numerical arguments. 
This can be done by defining f  as  
f[{h1_?NumericQ, h2_?NumericQ, h3_?NumericQ, h4_?NumericQ}] := ....

g.
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