On 28 Aug., 15:20, "John Cremona" <[EMAIL PROTECTED]> wrote:
> Thanks for your comments, David. I am having some success:
>
> The one thing I cannot get to work in the additive case is (for
> example) 2*g where g is a group element. I have tried all possible
> combinations of __lmul__, _lmul_, __rmul__, _rmul_, but although I
> have this ok:
>
> sage: a,b=A.gens()
> sage: b._lmul_(20)
> 2*b
> sage: 2*b
>
> inputting 20*b gives an error:
> TypeError Traceback (most recent call last)
> >> John
Hi John,
I have a class which derives from AdditiveGroupElement and whose
parent derives from AbelianGroup. Concerning multiplication I did not
implement more than __mul__() with two underscores ( and no _lmul_,
_rmul_, mil_impl-c ... and the like). It seems to work OK:
sage: A.<a,b,c> = FiniteQuadraticModule ('3^3')
sage: 5*a
2*a
sage: b*7
b
sage: -a +
2*c
2*a + 2*c
I cannot explain why this works, but if you want to have a look:
http://hg.countnumber.de/fqm-devel/file/98bb736f0c07/cn_group/finite_quadratic_module.sage
(and then line 2132 class
FiniteQuadraticModuleElement(AdditiveGroupElement).
---Nils
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