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MathGroup Archive 1999

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Re: FindMinimum

  • To: mathgroup at
  • Subject: [mg15866] Re: FindMinimum
  • From: "Hossein Kazemi" <kazemi at>
  • Date: Fri, 12 Feb 1999 18:40:27 -0500 (EST)
  • Organization: University of Massachusetts, Amherst
  • References: <79m6o0$>
  • Sender: owner-wri-mathgroup at

Sorry, I just noticed an error in my presentation of the problem.  The
correct for is:

f=Sign[4.35x-13.57y +Sqrt[1-x^2-y^2]] - Sign[2.49x-11.18y+

Hossein Kazemi wrote in message <79m6o0$3at at>...

>I have an expression that involves the Sign[] function.  For example,
>f=Sign[4.35x-13.57y +(1-x^2-y^2)]-Sign[2.49x-11.18y+(1-x^2-y^2)]+...
>I need to find the minimum of this function.  Since the symbolic
>derivatives with respect to x and y do not exist, I have to use
>But this does not restrict Mathematica not look outside (-1,1) range for
>where (1 - x^2 - y^2) will not be real.
>Is there anyway to find the minimum of a function when symbolic
>derivatives of
>the function do not exist and values outside a range should not be used.
>Thank you.
>kazemi at som.umass.edi

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