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Re: Simple questions about Mathematica

  • To: mathgroup at
  • Subject: [mg31902] Re: Simple questions about Mathematica
  • From: "Allan Hayes" <hay at>
  • Date: Mon, 10 Dec 2001 06:14:47 -0500 (EST)
  • References: <9uvhm2$ibq$>
  • Sender: owner-wri-mathgroup at

For your first question:





         A[Sqrt[a^2 + b^2]][B[Sqrt[a^2 + b^2]]]


Allan Hayes
Mathematica Training and Consulting
Leicester UK
hay at
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

"Stephen Gray" <stevebg at> wrote in message
news:9uvhm2$ibq$1 at
> 1. Suppose I solve some equations and get a complicated
> expression containing multiple identical elements such as
> sqrt(a^2+b^2). To make the expression smaller, clearer, and
> easier to deal with, I want to substitute say R=sqrt(a^2+b^2)
> everywhere in the main expression and have R available as
> a symbol from then on. I see nothing in Help or anywhere
> else about how to do this. But it's such a standard thing to
> do that there must be an easy answer.
> 2. I'm not sure how a "batch" file is suppposed to be
> prepared and fed to Mathematica. That is, I want to
> prepare a bunch of operations and variables in advance
> and feed it in, preferably having mathematica give me
> line-by-line output as it would if I were typing each line
> in  one by one.
>     As a new user I really need answers to these questions.
> Thanks in advance for any information.

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