# This made things very interesting.
# Using WordOptions(identifier='') does most of the work needed
### Example 1 ###
sage: (P,Q,R)=
MtxAlgebrasWithBasis(QQ).example(('P','Q','R')).algebra_generators()
sage: P*(Q+R)
B[word: PQ] + B[word: PR]
### Example 2 ###
sage: WordOptions(identifier='')
sage: P*(Q+R)
B[PQ] + B[PR]
# To go "all the way" a bit more code seems to be needed
# this is based on the _repr_ referred to in previous tip from Nicolas
def _repr_(self):
v = self._monomial_coefficients.items()
try:
v = sorted(v)
except StandardError: # Sorting the output is a plus, but if we
can't, no big deal
pass
repr_term = self.parent()._repr_term
# mons = [ repr_term(m) for (m, _) in v ]
mons = [ m.string_rep() for (m, _) in v ]
cffs = [ x for (_, x) in v ]
x = repr_lincomb(mons, cffs).replace("*1 "," ")
if x[len(x)-2:] == "*1":
return x[:len(x)-2]
else:
return x
# was tested using ...
_repr_((P+Q)*R)
'PR + QR'
This is what I was aiming to be printed when I do (P+Q)*R
Does this code (in the new _repr_) look ok?
Im aiming to do things consistently or to standards.
Anything better recommended?
I should be returning a string from _repr_ - shouldnt I ?
thanks
Ross
On Mon, Apr 12, 2010 at 6:41 PM, slabbe <sla...@gmail.com> wrote:
> Hi,
>
>> Im guessing the code to make the "B[word: ....]" string
>> may have been in a python file that corresponded to one of the
>> Categories above but couldnt find it
>
> The 'word: ' part comes from sage/combinat/words :
>
> sage: Word(range(10))
> word: 0123456789
> sage: Word(lambda n:n)
> word:
> 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,...
>
> Currently, one can change the identifier 'word: ' globaly by doing :
>
> sage: WordOptions(identifier='somethingelse')
> sage: Word(lambda n:n%10, length=20)
> somethingelse01234567890123456789
>
> Or one can erase it completely by doing :
>
> sage: WordOptions(identifier='')
> sage: Word(range(10))
> 0123456789
>
> Hence, we get the following which look better :
>
> sage: WordOptions(identifier='')
> sage: A = AlgebrasWithBasis(QQ).example()
> sage: A.an_element()
> B[] + 2*B[a] + 3*B[b]
> sage: A.one()
> B[]
> sage: A(1)
> B[]
>
> A cleaner solution would avoid changing the global identifier... but
> this needs some thoughts and adapt the code somewhere.
>
> Cheers,
>
> Sébastien Labbé
>
> --
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