#16662: OA for n=1046,1059,2164,3992,3994
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Reporter: ncohen | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.4
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: u/ncohen/16662 | 2f936c57507cbd475f860a76b94ed44882d7de7b
Dependencies: #16604 | Stopgaps:
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Comment (by ncohen):
Yooooooo !
> And:
> - what is the next value (like next_prime)
That's easy to do. It would be the result of
all_n(min=current_value,max=None).next()
> - what is the previous value (like previous_prime)
This would be harder, but I'm not sure it is needed either `O_o`
> The problem with your approach is that you store a lot of data. It is
perhaps not as bad as what I imagine.
it bothered me at first but we are thinking of k lists (and k<50 usually)
or size around 2000 at most. How bad can that be ? If it were stored in C
it would represent 500ko `:-P`
> 1) why do you stop `n` at `N-3` in the first loop? I think that `n=N-1,
m=1, a=1, b=0, c=0` is a valid input:
Argg... Because I thought we could assume `a,c,b>0`, I did some changes
then removed them, but I forgot one. If d=0 and c=0 I think that what the
code does is roughly equivalent to Wilson's construction wth 2 truncated
columns. But well, you are right, I will undo that !
> 2) the check `d <= n` is not necessary because of the lower bound on
`c`.
>
> I edit my commit at `u/vdelecroix/16662` to simplify the code with
respect to 2). As soon as 1) is solve, I would be happy to set this to
positive review.
I just downloaded your branch but did not see anything new. I just merged
it with the beta0 but I will add a commit in a second !
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16662#comment:33>
Sage <http://www.sagemath.org>
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