http://www.vector.org.uk/?vol=24&no=3&art=hui Bring Something Beautiful
----- Original Message ----- From: Devon McCormick <devon...@gmail.com> Date: Thursday, September 23, 2010 7:59 Subject: Re: [Jprogramming] Classification problem To: Programming forum <programming@jsoftware.com> > I agree with you in general but sometimes elegance and > correctness are foes > - but that's often only because the problem is "ugly" - see > http://www.paulgraham.com/taste.html . > > On Thu, Sep 23, 2010 at 9:55 AM, Robert Raschke > <rtrli...@googlemail.com>wrote: > > I disagree, first comes elegance and correctness, and these > tend to go hand > > in hand if you are concentrating on elegance. I quite strongly > believe a > > human reader is way more important than any machine. > > > > Robby > > > > On Thu, Sep 23, 2010 at 2:24 PM, R.E. Boss > <r.e.b...@planet.nl> wrote: > > > > > I agree. First comes correctness, then performance, then elegance. > > > > > > > > > R.E. Boss > > > > > > > > > > -----Oorspronkelijk bericht----- > > > > Van: programming-boun...@jsoftware.com [mailto:programming- > > > > boun...@jsoftware.com] Namens Brian Schott > > > > Verzonden: donderdag 23 september 2010 14:41 > > > > Aan: Programming forum > > > > Onderwerp: Re: [Jprogramming] Classification problem > > > > > > > > I agree that this solution is elegant, but for a large > data set I > > > > assume that Raul's idea of prepending and then dropping 3 > elements> > > would be more efficient. Don't you, too? > > > > > > > > (<@}./.~ *) _1 0 1,data > > > > > > > > On Thu, Sep 23, 2010 at 8:26 AM, R.E. Boss > <r.e.b...@planet.nl> wrote: > > > > > One of the more elegant solutions is > > > > > > > > > > ((/:&(* </. ])) *) data > > > > > +---------------+---+-----+ > > > > > |_3 _1 _10 _2 _4|0 0|1 1 6| > > > > > +---------------+---+-----+ > > > > > > > > > > > > > > > R.E. Boss > > > > > > > > > > > > > > >> -----Oorspronkelijk bericht----- > > > > >> Van: programming-boun...@jsoftware.com > [mailto:programming- > > > > >> boun...@jsoftware.com] Namens Marshall Lochbaum > > > > >> Verzonden: woensdag 22 september 2010 23:57 > > > > >> Aan: Programming forum > > > > >> Onderwerp: Re: [Jprogramming] Classification problem > > > > >> > > > > >> It looks to me like the most terse way is > > > > >> ((</. /: ~...@[)~ f) data > > > > >> > > > > >> Although this computes the nub twice, unlike some > earlier solutions. > > > > >> > > > > >> Marshall > > > > >> > > > > >> ________________________________________ > > > > >> From: programming-boun...@jsoftware.com [programming- > > > > >> boun...@jsoftware.com] On Behalf Of Raul Miller [ > > > rauldmil...@gmail.com] > > > > >> Sent: Wednesday, September 22, 2010 3:29 PM > > > > >> To: Programming forum > > > > >> Subject: Re: [Jprogramming] Classification problem > > > > >> > > > > >> Note, if * is the universe of interesting > > > > >> functions (if it does not need to be generic) then > > > > >> I would be tempted to use a variation on Dan's > > > > >> second suggestion: > > > > >> > > > > >> (<@}./.~ *) _1 0 1,data > > > > >> > > > > >> Note that this also preserves the relative > > > > >> ordering of the data items. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
