[newbie] how to expand function to original variables

As Barton suggests, it's not clear why you've define p and sigma as
functions, and A and hjmax as expressions.

If you'd like to keep the unexpanded form in some cases, there are a couple
of possible approaches:

* When using the function, don't write just the name (p), but the full call
p(...), but *quote* the call as 'p(...).  This is what we call a noun form.
 It will stay unevaluated until you do ev(<<expr>>, nouns) or more narrowly
ev(<<expr>>, p).

* You can also substitute the full value, e.g. subst(p(tau11,tau22), p,
hjmax).

          -s

On Mon, Feb 18, 2013 at 9:11 AM, Barton Willis <willisb at unk.edu> wrote:

> Since you defined p and sigma to be functions, I think you want something
> like (append arguments to p and sigma)
>
> (p(tau11,tau22):=tau11*tau22,
> sigma(tau11,tau12,tau22):=tau11+tau12+tau22,
>
> A:sqrt(p(tau11,tau22)^2+2*p(tau11,tau22)*sigma(tau11,tau12,tau22))-p(tau11,tau22),
>
> hjmax:sqrt((1+A/p(tau11,tau22))/((1-A/sigma(tau11,tau12,tau22)^2)^2+A/p(tau11,tau22))));
>
> Or maybe you wanted p and sigma to be expressions, not functions  (thus p
> : tau11 * tau22, sigma : =tau11+tau12+tau22)?
>
> --Barton
>
> ________________________________________
> From: maxima-bounces at math.utexas.edu [maxima-bounces at math.utexas.edu] on
> behalf of Hugo Coolens [coolens at kahosl.be]
> Sent: Monday, February 18, 2013 06:14
> To: maxima at math.utexas.edu
> Subject: [newbie] how to expand function to original variables
>
> I have the following code:
> p(tau11,tau22):=tau11*tau22;
> sigma(tau11,tau12,tau22):=tau11+tau12+tau22;
> A:sqrt(p^2+2*p*sigma)-p;
> hjmax:sqrt((1+A/p)/((1-A/sigma^2)^2+A/p));
>
> I now would like to see hjmax written again as a function of tau11, tau12,
> tau22.
> Can anyone here point me to which command to use for that purpose?
>
> thanks in advance
> hugo
>
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