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Re: simple pattern match question

• To: mathgroup at smc.vnet.net
• Subject: [mg91159] Re: simple pattern match question
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Fri, 8 Aug 2008 07:12:26 -0400 (EDT)
• References: <g7ed78$2po$1@smc.vnet.net>

Hi,

because you mean f[x_?NumericQ]:=x^2

Regards
   Jens

congruentialuminaire at yahoo.com wrote:
> Hello UG:
> 
> I am trying to understand simple pattern rule evaulation. The
> following trivial examples baffles me:
> 
> ---------------------------------------------------
> In[1]:= f[x_Number] := x ^ 2
> In[2]:= f[3]
> Out[2]= f[3]
> 
> In[3]:= f[3.3]
> Out[3]= f[3.3]
> 
> In[4]:= NumberQ[3.3]
> Out[4]= True
> --------------------------------------------------
> Why is it that f[3.3] does not evaluate??
> 
> TIA.
> 
> Regards..RogerW
>