I'm guessing this is just due to you using dict() in the function
definition. See http://effbot.org/zone/default-values.htm . If you
replace it with None do something like
if l is None:
l = {}
at the beginning of the function, then things should be okay.
--Mike
--Mike
On Sat, Jun 29, 2013 at 11:29 AM, Matthieu Deneufchâtel
<matthieudeneu...@yahoo.fr> wrote:
> In a recursive function, I use a dictionary (which contains the elements of
> the expansion of the argument on another basis). Since each call to the
> function needs the dictionary, I don't want the user to be forced to put the
> dictionary as an argument (i.e. I want him to call to_pbw(elem) instead of
> to_pbw(elem,{})). But I get a little confused between local and global
> variables with the code below since the dictionary is not emptied when
> needed (my function as the expected behavior only when I call
> to_pbw(elem,{})).
>
> Could anyone help me (provided my question is not unclear)?
> Matthieu
>
> def to_pbw(f,l=dict()):
> from sage.combinat.words.finite_word import to_monoid_element
> if f!= 0 * f.parent().one():
> support = [to_word(i[1]) for i in list(f)]
> min=support[0]
> if len(support) > 1:
> for word in support[1:len(support)-1]:
> if min.lex_less(word):
> min = word
> coeff = list(f)[support.index(min)][0]
> if min not in l.keys():
> l[min]=coeff
> else:
> l[min] += coeff
> remainder = f - coeff * pbw_element(to_monoid_element(min))
> return to_pbw(remainder,l)
> return l
>
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