Why not making it a package? Or at least share it on pasterack [1] or gist [2]? I'm sure other people will be happy to find it in the future.
Laurent [1] http://pasterack.org/ [2] gist.github.com On Tue, May 6, 2014 at 8:52 PM, Jos Koot <jos.k...@gmail.com> wrote: > Hi Phil, Deren and Jensaxel, > Thanks for your quick responses. > > To Phil: > I have read your code, but it is not lazy. > I think that for large n memory is going to be a problem. > Your eager approach resembles much my lazy code, but I produce the > partitions in reverse order. > Thanks anyway. > > To Deeren > I'll send you the code privately. > As an example of the ordering: > (stream->list (make-partitions-stream 5)) -> > > > ------------------------------ > *From:* Deren Dohoda [mailto:deren.doh...@gmail.com] > *Sent:* martes, 06 de mayo de 2014 20:36 > *To:* Jos Koot > *Cc:* Racket mailing list > *Subject:* Re: [racket] partitions > > Hi Jos, > > Actually I'd love to have you share it. I did write myself a partition > generator but it was eager and I never went back to make it into a sequence > or stream, though I'm sure it was somewhere in my to-do list. How are they > ordered? > > Deren > > > On Tue, May 6, 2014 at 2:26 PM, Jos Koot <jos.k...@gmail.com> wrote: > >> Hi >> >> Library *math/number-theory* provides procedure *partitions*, >> which fastly tells you how many partitions a given nonnegative integer has >> (based on http://en.wikipedia.org/wiki/Partition_(number_theory)) >> >> I have not found any procedure that generates the partitions themselves, >> nor in PLT Racket nor in Planet. >> >> Therefore I made my own code for procedures that >> produce (lazy) streams and sequences of partitions >> (make-partition-stream n) and (in-partitions n). >> >> If you are interested, let me know and I'll send you the code. >> It is too long to include it in this mail >> (77 lines of docs, 31 lines of code and 160 lines of tests) >> >> I would be happy with some feedback on my code. >> Or even happier with a pointer to already existing code. >> >> Best whishes, Jos >> >> ____________________ >> Racket Users list: >> http://lists.racket-lang.org/users >> > > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users > >
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