Hi Nathann,
On Aug 26, 6:08 pm, Nathann Cohen <nathann.co...@gmail.com> wrote:
[...]
> But I have two questions now :
> * Could it be possible to define variables indexed two times ?
> Something like y[0][1]*y[2][3] ?
> Could it even be possible to define "dictionary" variables ( I
> mean a dictionary of variables )
> y["g"]*y["h"]
I don't see the problem, because *anything* can be stored as value in
a dictionary.
Or is your question: How do I generate a dictionary?
Then, you might do
sage: R = QQ['y0, y1, y2']
sage: names = ['a','b','c']
sage: D = dict(zip(names,R.gens()))
sage: D
{'a': y0, 'b': y1, 'c': y2}
sage: D['b']
y1
> * Besides, when I have on one hand a variable y :
> y = RR['y0, y1, y2'].gens()
>
> And a variable x :
>
> x = RR['x0, x1, x2'].gens()
>
> How can I easily multiply x[0]*y[2] or add them ?
I think there is no easy way, simply because there is no "obvious"
ring into which both RR['y0, y1, y2'] and RR['x0, x1, x2'] coerce.
So, AFAIK, you have to explicitly define a ring that fits both, and
use conversion (rather than coercion):
sage: R.<a,b,c> = QQ[]
sage: S.<x,y,z> = QQ[]
sage: T = QQ['a,b,c,x,y,z']
sage: a*x
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
...
TypeError: unsupported operand parent(s) for '*': 'Multivariate
Polynomial Ring in a, b, c over Rational Field' and 'Multivariate
Polynomial Ring in x, y, z over Rational Field'
sage: T(a)*T(x) # T(a) means: Interprete a as an element of T.
a*x
Cheers,
Simon
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