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MathGroup Archive 1997

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Re: pattern test and default value

  • To: mathgroup at
  • Subject: [mg6003] Re: [mg5967] pattern test and default value
  • From: seanross at
  • Date: Sat, 8 Feb 1997 22:38:42 -0500
  • Sender: owner-wri-mathgroup at

Marlies wrote:
> Hi,
> It is possible to do the following:
> x_h:v (an expression with head h and default value v)
> Can anyone tell me whether it is possible to have a pattern test like
> _?NumberQ  AND have a certain default value?
> Regards,
> Marlies Brinksma


I routinely use this format for things like testing for square matrices 
of a certain length and input parameter management.

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