Hi everyone,
I just noticed that the default basis ring for ambient space has been
changed to cyclotomic field. I don't know the reason behind that but
it doesn't seem handy !
In my case, I use the elements of the ambient space to index another
combinatorial free module and it is a pain that their basis ring
elements are not number.
Here is an example:
sage: R = RootSystem("A3")
sage: A3 = R.ambient_space()
sage: key = A3.an_element()
sage: key
(2, 2, 3, 0)
sage: key[0]
2
sage: type(key[0])
<class
'sage.rings.universal_cyclotomic_field.universal_cyclotomic_field.UniversalCyclotomicField_with_category.element_class'>
sage: xrange(key[0])
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/home/pons/sage-5.0.rc0/devel/sage-combinat/<ipython console> in <module>()
TypeError: an integer is required
This type of thing just broke my entire patch on multivariate
polynomials. I had to fix it by changing the field to ZZ or QQ but I
wonder why the default field has been changed...
Cheers
Viviane
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