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MathGroup Archive 1999

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  • To: mathgroup at
  • Subject: [mg15823] FindMinimum
  • From: "Hossein Kazemi" <kazemi at>
  • Date: Mon, 8 Feb 1999 03:25:47 -0500 (EST)
  • Sender: owner-wri-mathgroup 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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