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MathGroup Archive 2001

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A problem about ConstrainedMax

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28529] A problem about ConstrainedMax
  • From: xpzhu at red.semi.ac.cn
  • Date: Wed, 25 Apr 2001 01:30:32 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

hi,
  If we use ConstrainedMax[f[x],{x1<x<x2},x] to obtain the maximum of
f[x] in region {x1,x2}, it seems that f[x] should not include imaginary
part. e.g.,
In[1]:=ConstrainedMax[Abs[x+I],{1<x<2},x]
       ConstrainedMax::cmfc: Constant term Abs[I+x] in Abs[I+x] is not a 
           real number
Out[1]=ConstrainedMax[Abs[x+I],{1<x<2},x]
  Which function can give me the maximum of the absolute value of a 
complex fuction f[x] in {x1,x2}?

thanks a lot

Zhu X. P.


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