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MathGroup Archive 2004

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FindMinimum: foo[x_?NumericQ] vs. NumberQ

  • To: mathgroup at smc.vnet.net
  • Subject: [mg46674] FindMinimum: foo[x_?NumericQ] vs. NumberQ
  • From: frankeye at cox.net (Frank Iannarilli)
  • Date: Fri, 27 Feb 2004 19:32:02 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,


In a November 2003 thread by Jiang Xiao, the group recommended a fix
for:

  FindMinimum[foo[x],{x,x0,x1...}]

whereas FindMinimum was evidently attempting a symbolic gradient
evaluation of foo[], even though the invocation was indicating to use
numeric derivatives.

The recommended fix was to redefine foo[] as so:

  foo[x_?NumericQ]

This evidently worked for all involved, but I tried it on what I
thought was a similar problem, and had no luck.

However, what did work was using NumberQ instead of NumericQ in the
pattern-match test.  Go figure.

HTHs somebody.


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