Re: With[{software=Mathematica}, Frustration]

*To*: mathgroup at smc.vnet.net*Subject*: [mg24319] Re: [mg24308] With[{software=Mathematica}, Frustration]*From*: Maarten.vanderBurgt at icos.be*Date*: Sun, 9 Jul 2000 04:52:30 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Hi, Try With[{a = 2, b = 3}, Evaluate[c]]. Maarten AES <siegman at stanford.edu> on 07-07-2000 06:11:52 AM Subject: [mg24319] [mg24308] With[{software=Mathematica}, Frustration] Pages 359-360 of The Mathematica Book says (admittedly, taken a little out of context), "You can think of With as a generalization of the /. operator. . ." and " With[{x=x0}, body] works essentially like body /. x->x0 . . . " Great, looks neat, let's try it for evaluating expressions without permanently setting the variables in them: In[1]:= c = a b Out[1]= a b In[2]:= c Out[2]= a b In[10]:= c /. {a -> 2, b -> 3} Out[10]= 6 In[3]:= With[{a = 2, b = 3}, c] Out[3]= a b *Not* what I was hoping for . . .