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Re: Checking the form of an option

  • To: mathgroup at
  • Subject: [mg21170] Re: Checking the form of an option
  • From: Jens-Peer Kuska <kuska at>
  • Date: Fri, 17 Dec 1999 01:22:52 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <831k39$>
  • Sender: owner-wri-mathgroup at


you must do it by hand.
One way is to make a function that has all options as parameters and a
wrapper that
extract the parameter values from the options. The second way is to make
functions that
expand the multiple values say you have a ImageSize option the may be
set to
Automatic, width and width and height of your image 

    Automatic, {256,256},
    _Integer, {size,size},
    {_Integer,_Integer}, size,
    _, {256,256}

you may add some usefull error messages in the last case.

Hope that helps

DIAMOND Mark wrote:
> I want to check whether option "K" to a function is an integer, a list of
> single numbers, or neither of these, and then to execute one of three
> different statements.
> If these K were a simple parameter, I could do it with
> f[k_Integer] := functionBody;
> f[k:{_Integer}..] := functionBody;
> f[k_] := functionBody
> but I cannot see how to check for similar conditions on an *option* inside
> one function. Can anyone help?

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