#16884: Quasi-difference matrices (database+is_QDM)
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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: public/16884 | 15c78ba967f5f15644a7eb83f2825de3ba5fd7fd
Dependencies: #16879 | Stopgaps:
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Comment (by ncohen):
Hello !
> 1) In the definition of quasi difference matrix, why do you require the
group G to be Abelian? I saw that your definition coincides with the one
from the handbook... but still. The question is just why. I don't mind the
restriction since I do not know of any example on a non-commutative group.
No other reason, I just took the def from the Handbook.
> 2) You did not modify the doctests, is it on purpose
Nonono it is a mistake, I first wrote those functions when we had no
`is_quasi_difference_matrix` function and I had no other choice. It is
fixed. Plus the '0' in the functions was actually a 1 and I had forgotten
to update it.
I also changed the layout of the QDM dictionary: as for other
dictionaries, the 'k' is a key. It is easier this way, I learned that by
writing my update to the Brouwer-van Rees construction (which I will
update now).
And after the Brouwer-van Rees construction is reviewed I will have to
thing hard about a `find_*` function. The good news is that it should make
many - disappear `:-P`
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16884#comment:11>
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