Re: simple pattern match question
- To: mathgroup at smc.vnet.net
- Subject: [mg91186] Re: simple pattern match question
- From: amzoti <amzoti at gmail.com>
- Date: Fri, 8 Aug 2008 07:17:43 -0400 (EDT)
- References: <g7ed78$2po$1@smc.vnet.net>
On Aug 7, 1:54 am, congruentialumina... 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 Didn't you want the following? f[x_?NumberQ] := x^2 f[3] = 9 f[3.3] = 10.89 f[p] = f[p] You could also do thing like f[x_?IntegerQ] := x^2 f[3] = 9 f[3.3] = f[3.3] Hope I understood your original question correctly . ~W