[racket] FW: q about code for partitions

Ah, that explains it. Thanks!

Vincent


At Sun, 29 Jun 2014 12:32:48 -0700,
Eric Dobson wrote:
> 
> Vincent: exact-zero? is defined through 'make-predicate' which uses
> contract machinery to generate the function. I filed a couple of bugs
> tracking some of the slowness issues. There is no `contract` form
> though so I doubt that the coach will find it.
> 
> http://bugs.racket-lang.org/query/?cmd=view%20audit-trail&database=default&pr=14610
> http://bugs.racket-lang.org/query/?cmd=view%20audit-trail&database=default&pr=14611
> 
> On Sun, Jun 29, 2014 at 11:53 AM, Jos Koot <jos.koot at gmail.com> wrote:
> > Great work, Jens. I am glad my approach as been adopted (and much improved
> > without deviating from the original idea of simpler recurrence). When can we
> > expect it in the next nightly build?
> >
> > Thanks, Jos
> >
> >> -----Original Message-----
> >> From: jensaxelsoegaard at gmail.com
> >> [mailto:jensaxelsoegaard at gmail.com] On Behalf Of Jens Axel Søgaard
> >> Sent: domingo, 29 de junio de 2014 12:48
> >> To: Matthew Flatt
> >> Cc: Jos Koot; Racket Users List
> >> Subject: Re: [racket] FW: q about code for partitions
> >>
> >> I have made a new vector version using zero? instead of exact-zero?.
> >>
> >> To give users a chance to remove the cache after doing
> >> partitions calculations,
> >> I have added set-partitions-cache.
> >>
> >>    Code:
> >>
> >> https://github.com/soegaard/racket/blob/patch-14/pkgs/math-pkg
> > s/math-lib/math/private/number-theory/partitions.rkt
> >>
> >>    Discussion:
> >>     https://github.com/plt/racket/pull/697
> >>
> >> /Jens Axel
> >>
> >>
> >> 2014-06-29 12:44 GMT+02:00 Jens Axel Søgaard <jensaxel at soegaard.net>:
> >> > 2014-06-29 8:47 GMT+02:00 Matthew Flatt <mflatt at cs.utah.edu>:
> >> >> It looks like "partitions2.rkt" ends up calling a contract-wrapped
> >> >> variant of `exact-zero?`.
> >> >
> >> > That explains why Eric saw an improvement, when the used #f
> >> instead of
> >> > 0 as the not-cached-yet value.
> >> >
> >> > /Jens Axel
> >>
> >>
> >>
> >> --
> >> --
> >> Jens Axel Søgaard
> >
> >
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