Update:
In maxima, I simply have to answer 'no' to the question whether n is an
integer and I obtain the solution. How can I pass the 'no' to maxima
through sage??
Stan
Stan Schymanski wrote:
> Dear all,
>
> How can I get sage to solve a simple equation such as the one below?
>
> ----------------------------------------------------------------------
> | Sage Version 4.0.2, Release Date: 2009-06-18 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: var('x y n')
> (x, y, n)
> sage: solve(y == x^n,x)
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
> [...]
> TypeError: Computation failed since Maxima requested additional
> constraints (try the command 'assume(>0)' before integral or limit
> evaluation, for example):
> Is n an integer?
>
> MMA solves similar equation using inverse functions and spits out a
> warning, no matter whether n is an integer or not. I thought that
> Maxima would do the same as stated in the docu.
>
> Here is an excerpt from the Maxima 5_15 docu:
>
> "Let E be the expression and X be the variable. If E is linear in X
> then it is trivially solved for X. Otherwise if E is of the form A*X^N
> + B then the result is (-B/A)^1/N) times the N'th roots of unity."
>
> Is this a problem with the sage->maxima interface? I also wanted to
> try Sympy as suggested in another post, but Sympy does not seem to be
> included in the new version of sage any more. Am I misunderstanding
> something?
>
> Thanks for your help!
>
> Stan
>
> >
>
--
________________________________________
Stan Schymanski
Scientist
Max Planck Institute for Biogeochemistry
Postfach 10 01 64
D-07701 Jena
Phone: +49.3641.576264
Fax: +49.3641.577274
WWW: http://www.bgc-jena.mpg.de/~sschym
Biospheric Theory and Modelling Group
http://www.bgc-jena.mpg.de/bgc-theory/
_________________________________________
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