Validating functions input
- To: mathgroup at smc.vnet.net
- Subject: [mg58784] Validating functions input
- From: "Nilton" <nilton.volpato at ig.com.br>
- Date: Mon, 18 Jul 2005 03:21:21 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
I have a function that must have its input validated.
I want to validate if x <= 2^y. If it's valid, then just return the
symbol f[x,y] unevaluated. If it's not valid, I want to return some
symbol, Null for instance, and issue an error message.
The following is a try, but it doesn't work, because it's definition is
f::invalid = "Invalid arguments"
f[x_,y_] := If[x <= 2^y, f[x,y], Message[f::invalid]]
Is there any way to implement this?
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