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  . . .

```

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