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Re: Validating functions input

• To: mathgroup at smc.vnet.net
• Subject: [mg58806] Re: Validating functions input
• From: "dkr" <dkrjeg at adelphia.net>
• Date: Tue, 19 Jul 2005 04:10:16 -0400 (EDT)
• References: <dbflkk$n0p$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

In[11]:=
f::invalid = "Invalid arguments" ;

f[x_,y_]:=Message[f::invalid]/;x>2^y;

f[x_,y_]:=HoldForm[f[x,y]];

In[14]:=f[2,3]

Out[14]=f[2,3]

In[15]:=f[8,2]

f::invalid: Invalid arguments