Salut Nicolas,
Thanks for taking care of it. I would like cartesian products to be
smarter about iteration... especially when one of the factor is
infinite. I have a working implementation of the iterator that you can
use on the sage-combinat misc repo.
Best,
Vincent
2013/11/15, Nicolas M. Thiery <nicolas.thi...@u-psud.fr>:
> Salut Vincent,
>
> On Thu, Nov 14, 2013 at 10:43:19PM -0500, Vincent Delecroix wrote:
>> For me it is a bug: the behavior of cartesian_product (not
>> CartesianProduct) is not symmetric...
>> {{{
>> sage: C1 = cartesian_product([FiniteEnumeratedSet('abc'),ZZ])
>> The cartesian product of ({'a', 'b', 'c'}, Integer Ring)
>> sage: C1
>> sage: C1.an_element()
>> ('a', 1)
>> }}}
>> but
>> {{{
>> sage: cartesian_product([ZZ,FiniteEnumeratedSet('abc')])
>> Traceback (most recent call last):
>> ...
>> AttributeError: type object
>> 'sage.rings.integer_ring.IntegerRing_class' has no attribute
>> 'CartesianProduct'
>> }}}
>> And by the way, why CartesianProduct still exist ?
>
> Thanks for the report!
>
>> I would be happy to fix that if I know what to do.
>
> I just created #15425 for this, with pointers towards what should be
> done. Please add there any further bug/feature of cartesian products I
> may have missed.
>
> Cheers,
> Nicolas
> --
> Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
> http://Nicolas.Thiery.name/
>
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