Hey Matthieu,
The problem is you are returning the *original* *modified* object you
passed in, not a new object like you seem to be expecting. Just make a copy
of l before making any changes to it. Since the function is straight
forward, I'd recommend just making it iterative using a while lo
I might have misunderstood your suggestion, but I don't think that it is
the solution (I tried it and I get the same problem).
My problem is that when I try the same expansion several times in a row,
the list is not cleared after each call and thus the coefficients are false:
sage: M=FreeMonoid(2
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, 201
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
