#19221: Some new (n,2^k,1)-BIBD
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Reporter: ncohen | Owner:
Type: enhancement | Status:
Priority: major | needs_info
Component: combinatorial designs | Milestone: sage-6.9
Keywords: | Resolution:
Authors: Nathann Cohen | Merged in:
Report Upstream: N/A | Reviewers: Vincent
Branch: | Delecroix
78d008dce6ad2f415dc703861b529f6fa0e95841 | Work issues:
Dependencies: | Commit:
| Stopgaps:
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Comment (by dimpase):
Replying to [comment:25 ncohen]:
> > but `labels` are meant to be user-defineable
>
> Whaaaat? I don't know what makes you think that. `labels=False` makes
sense to me. There is nothing in that word that says 'user-defineable' or
anything. If you want to change the labels, `.relabel` is there for you.
well, `.relabel()` does relabel things in a user-defineable way (at least
it has this option).
>
> > Calling a set of labels chosen by the implementation `labels` is
unhelpful and uninformative, to say the least.
>
> It just means that the structure is not integer-labelled. Any way I
cannot care less: if you chose to overlook that all our functions will
have as many ways to call the same thing (labels, coordinate, ... do you
see this end?) then I will not fight again, it's your win anytime because
you are the reviewer and by Sage's laws you can make my life hell until I
give up.
I merely say that `coordinates` is more informative name for this
parameter.
Do you agree? If yes, I will change this on #19226, to make it uniform
with !ProjectiveGeometryDesign.
>
> So add a commit.
this ticket is closed, as you know. How about #19226?
>
> > > If I remember correctly, the explanation to that lies in the running
times.
> > Indeed, it's 50 times faster on PG(2,16). I wonder why...
>
> Surprising. Might be because we are multiplying the elements of the
ground set using Sage, which is always slow for ... well, everything.
Perhaps the way `PG` is called changed in the meantime, I do not remember.
If you feel bad about it you can write a ticket, it's always good to see
speed improvements.
probably it's because it handles the case of 1-dimensional subspaces by
generic code, which does linear algebra on matrices...
--
Ticket URL: <http://trac.sagemath.org/ticket/19221#comment:27>
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