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Re: pattern

  • To: mathgroup at smc.vnet.net
  • Subject: [mg84373] Re: pattern
  • From: Bill Rowe <readnewsciv at sbcglobal.net>
  • Date: Thu, 20 Dec 2007 00:14:41 -0500 (EST)

On 12/19/07 at 4:14 AM, orelang at gmail.com wrote:

>I want to define a function that accepts only one argument - a 2x2
>matrix and not any more.

>Is it possible?

Yes. For example

f[x_]:=Total[x]/;Dimensions[x]=={2,2}

will return a list of two elements if x is a 2 x 2 matrix and
will return f[x] unevaluated if x is not a 2 x 2 matrix.
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