Re: Checking the form of an option
- To: mathgroup at smc.vnet.net
- Subject: [mg21170] Re: Checking the form of an option
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 17 Dec 1999 01:22:52 -0500 (EST)
- Organization: Universitaet Leipzig
- References: <831k39$dju@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi, 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 makeImageSize[size_]:= Switch[size, 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 Jens 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?