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Re: Options[] creation

  • To: mathgroup at
  • Subject: [mg39255] Re: [mg39217] Options[] creation
  • From: Omega Consulting <omega_consulting at>
  • Date: Thu, 6 Feb 2003 03:07:47 -0500 (EST)
  • Sender: owner-wri-mathgroup at

If the only shapes are Circle and Ellipse, then I would merge the two 
options into a single option.

Diameter->d gives a Circle. Diameter->{dshort, dlong} gives an ellipse.

Another technique would be to make the diameter(s) a parameter of the shape.

Shape->Circle[d] and Shape->Ellipse[dshort, dlong]

At 01:21 AM 2/4/2003, Kyriakos Chourdakis wrote:
>Dear all,
>Suppose I create a function f[x_,opts___]
>with options
>Shape in {Circle,  Ellipsis} and Diameter in R+, DiameterLong in R+,
>DiameterShort in R+
>Say that the defaults are
>Options[x]={Shape->Circle, Diameter->1.}
>The option Diameter makes sence only when Shape->Circle, and
>The options DiameterShort/Long make sense only when Shape->Ellipsis
>Is there a quick way to tell Mathematica to warn if these conditions are
>not satisfied? I could write a series of boolean tests, but I was wondering
>if there is a more elegant way.
>Kyriakos Chourdakis
>Lecturer in Financial Economics
>tel: (++44) (+20) 7882 5086
>Dept of Economics
>University of London, QM
>London E1 4NS

Omega Consulting
"The final answer to your Mathematica needs"

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