> Jason Bandlow has been working on this - see his patches (on top of
> David Roe's) at #2291. I don't know in which state that code is, but
> it would be nice if somebody could play with it so we can shake out
> the bugs and merge this once it is ready. There is certainly demand
> for this feature ;)
I applied all five patches to sage-2.10.4.
R.<x,y> = LaurentPolynomialRing(QQ,2); R
This works and is what I need immediately. Not everything works for me and I
have some comments on the documentation.
> 1. LaurentPolynomialRing(base_ring, name, sparse=False):
> sage: PolynomialRing(QQ, 'w')
> Univariate Laurent Polynomial Ring in w over Rational Field
Should the second line read LaurentPolynomialRing ?
> INPUT:
> base_ring -- a commutative ring
> name -- a string
> names -- a list or tuple of names, or a comma separated string
> n -- a positive integer
Perhaps it should be stated explicitly somewhere that n is the number of
generators.
> Use the diamond brackets notation to make the variable
> ready for use after you define the ring:
> sage: R.<w> = LaurentPolynomialRing(QQ)
> sage: (1 + w)^3
> w^3 + 3*w^2 + 3*w + 1
This doesn't work for me. I get:
sage: R.<w> = LaurentPolynomialRing(QQ)
[snip]
261 break
262 R = _single_variate_poly(base_ring, name, sparse)
--> 263 RR = _multi_variate_poly(base_ring, (name, prepend_string + name),
2, False, 'degrevlex')
264 P = LaurentPolynomialRing_generic(base_ring, 1, R, RR,
prepend_string, (name,))
265 _save_in_cache(key, P)
<type 'exceptions.TypeError'>: cannot concatenate 'str' and 'tuple' objects
I realize that I'm commenting on work in progress (that is immediately
useful to me). I won't list more failures like this since they're turned up
by sage -t laurent_polynomial_ring.py.
Thanks,
Dan
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