jblazi wrote:
>
> I am trying to find out whether I can use Maxima for teaching. So I installed
> Maxima (and GCL, by the way).
>
> I have written a lisp function $f in a file that is called "mytest.lisp" and
> is in the current directory. It is extremely simple:
>
> (defun $f (x) (* x x))
>
> Can I load this function into maxima and call it?
It must be in the same package as maxima, so you need an in-package
line in the file.
It should return (when
> called from Maxima):
>
> (1) 4 when called like (f 2)
>From a command line it would be called by f(2);
> (2) 3+2sqrt(2) when called like (f (+ 1 (sqrt 2)))
No, you are call the LISP + function, not the maxima "simplify"
function.
The LIsp function only knows about the usual numeric lisp data.
To do that you could do, for example (defun $f(x)(simplifya (list
'(mtimes) x x) t))
which would also return 4.
> (3) a^2+2a+1 when called like (f (+ a 1))
>
Why don't you just use the maxima functionality?
For example you could do f(x):=expand(x^2);
translate(f); .... change it into lisp
save ("filename", f);
or some similar sequence. I haven't tried this, but you
should get the idea.
RJF
> (In the third case, maybe some other function like expand in Maple could be
> nexessary, but this would be o.k. What I mean is, my function should be able
> to handle whatever unput is sensible in Maxima.)
>
> TIA,
>
> Janos Blazi
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