#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 | f0b7bab049e078a663702a935ea5f09facd396ed
Dependencies: #16879 | Stopgaps:
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Comment (by ncohen):
Yo !
> You mean a value I gues. As the code is
Indeed. And I may do the same for 'mu' in the future too. This variable is
mostly useless.
> You can also set the values by hand (but still try hard to find more
values).
I began to write something which may more or less work. But today I had to
clean the house in which I spent the week, tomorrow will be filled with
travelling and sunday too. Adventure `:-P`
> 3) When there does exist a good `QDM` to build an `OA(k,n)`, could we
use `_OA_cache_set(kk,n,True)` instead of `_OA_cache_set(k,n,True)`. We
will win some few calls (especially when running `MOLS_table`).
I don't understand your sentence `O_o`
> 4) I wonder if such things as 3) above is doable with
`difference_matrix` as well. For example we could put a call to
`_OA_cache_set` inside `difference_matrix` to set the existence to a
potentially bigger `k`. Alternatively, one can write
`_OA_cache_set(n,difference_matrix(n,None,existence=True))` in the core of
`orthogonal_array` but it might be slower.
Hmmmm.. I prefer that only the OA constructor plays with the `OA_cache`. I
thought once or twice while coding that it was a good thing but I forgot
why.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16884#comment:16>
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