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Re: Simple questions about Mathematica


Stephen,
For your first question:

    rl=Sqrt[a^2+b^2]\[Rule]R;

    A[Sqrt[a^2+b^2]][B[Sqrt[a^2+b^2]]]/.rl

        A[R][B[R]]

    %/.Reverse[rl]

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

--
Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565


"Stephen Gray" <stevebg at adelphia.net> wrote in message
news:9uvhm2$ibq$1 at smc.vnet.net...
> 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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