MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive


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

  • Prev by Date: Re: Problem with Fonts
  • Next by Date: Re: I am looking for code to READ DXF files in Mathematica
  • Previous by thread: FindMinimum
  • Next by thread: Re: FindMinimum