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Re: FindMinimum numerical constraint functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg110861] Re: FindMinimum numerical constraint functions
  • From: "Stuart Nettleton" <Stuart.Nettleton at uts.edu.au>
  • Date: Thu, 8 Jul 2010 20:34:21 -0400 (EDT)

Hi Daniel,
Looking deeper, I was perhaps too happy to see a solution. You have the  
condition "/;VectorQ[vals, NumberQ]" in the constraint function using  
"vals" instead of "vars". Is this still symbolic execution? If I add "&&  
VectorQ[vars, NumberQ]" there is an execution error.
Stuart


On Fri, 09 Jul 2010 08:30:15 +1000, Stuart Nettleton  
<Stuart.Nettleton at uts.edu.au> wrote:

> Hi Daniel,
> I am pleased that FindMinimum is happy with constraint return values  
> like {True, False, False} etc.
> This gives me a whole new perspective.
> Thanks once again for a magnificent insight!
> Best regards,
> Stuart
>
>> obj[vars_] := Sin[vars[[1]]]*Sin[2*vars[[2]]] /; VectorQ[vars, NumberQ]
>>
>> con[vars_List, vals_] :=
>>    Thread[{vars[[1]]^2 + vars[[2]]^2, -vars[[1]], -vars[[2]]} <= vals]  
>> /;
>> 	VectorQ[vals, NumberQ] && Length[vals]===3
>>
>> FindMinimum[{obj[vars], Thread[con[vars,{3,0,0}]]}, vars]


-- 
Dr Stuart Nettleton
PhD, FCPA, MBA, MEngSci, BEng(Hons), GradDipAICD
Senior Lecturer
School of Management & Systems
Faculty of Engineering & IT
Energy Policy Research Centre

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