On Fri, Jun 26, 2009 at 07:11, Stan Schymanski<schym...@gmail.com> wrote:
>
> 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??
>
Try to use assume() befotre the call to maxima?
> 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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