On Mon, Apr 12, 2010 at 10:12:47PM +0930, ross kyprianou wrote:
> # 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()
Do you need a specific category for your application? In particular,
will you have several parents between which to share code?
Otherwise, you could just implement a parent.
> 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
Cool :-)
> 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 ?
If the only change is on the repr_term line, you might as well
override the method _repr_term in the parent; that's its purpose!
Best,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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