Hi Frédéric,
Sorry for not answering sooner. I was giving a talk at Strasbourg at Kurush
and Frederic F. conference). So I was busy preparing my talk (among other
things).
> I have tried to implement a morphism of operads (from the PreLie
> operad to the Dendriform operad) but I have some problem with
> codomains. Could somebody help ?
>
> with my patch "free_operads_fc.patch" applied :
>
> sage: PL=PreLieOperad(QQ)
> sage: DO=DendriformOperad(QQ)
> sage: PLT=PL.basis().keys()
> sage: t0=PL(PLT([],'a'))
> sage: PL.operad_morphism(PL,t0)
> sage: PL.operad_morphism(DO,t0)
>
> the last two lines both returns an error related to codomain.
I had a look at your problem. One of the problem came from lazy_attribute in
operads_with_basis: you cannot use lazy_attribute with a something which takes
parameters. The role of lazy_attribute is (among other things) to save the
typing of () such as in PL.one(). One could have used PL.one but this was
ruled out for interface consistency reason.
Back to your problem, you can't spare a () because you have the codomain. So
you probably want to write things the following way:
sage: PL2PL = PL.operad_morphism(PL) # define the morphism
sage: PL2PL(t0) # apply it
B[a[]]
sage: PL2DO = PL.operad_morphism(DO)
sage: PL2DO(t0)
B[a[None, None]]
sage: PL2DO(t0 < t0)
-B[a[None, a[None, None]]] + B[a[a[None, None], None]]
Does this makes sens to you ?
I uploaded a patch named operad_morphism_fix-fh.patch which makes the previous
examples work. Please fold it in yours (after making sure that you don't have
any uncommited modifications:
sage -hg pull -u
sage -hg qgoto free_operads_fc.patch
sage -hg qfold operad_morphism_fix-fh.patch
And then as usual
cd ../../../.hg/patches
sage -hg commit -m "Folded operad_morphism_fix-fh.patch"
sage -hg push
I hope this fixes your problems. Just a remark: I checked that the code
returned a result not that this is indeed the correct result. Please quadruple
check.
Cheers,
Florent
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