My timings agree with the ones on your clean system: "pair3" is fastest,
followed by "pair2", then by "2&comb3"; all three are pretty close to each
other and are much faster than the original "pairi":
rnk2 100&ts&>'pairi y';'pair2 y';'2&comb3 y';'pair3 y' [ y=. 1000
3 29.78 2.61 0.484 2.517e7
1 1.17 1.00 0.019 9.640e6
2 1.20 1.00 0.020 9.636e6
0 1.00 1.00 0.016 9.636e6
On Fri, Nov 7, 2008 at 10:28 AM, R.E. Boss <[EMAIL PROTECTED]> wrote:
> On a cleaner system I get
>
> rnk2 5&ts&>'pair2 y';'2&comb3 y';'pair3 y'[y=.5000
> 1 1.04 1.00 0.737 2.834e8
> 2 1.11 1.00 0.791 2.833e8
> 0 1.00 1.00 0.711 2.833e8
>
> rnk2=: 1 7j2 5j2 10j3 8j_3 ": (,.~[: (/:@/:@:({."1) ,. }."1) (%"1
> <./)@:(,.~
> */"1)) NB. wrap around!
>
>
> R.E. Boss
>
>
> -----Oorspronkelijk bericht-----
> Van: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Namens Arie Groeneveld
> Verzonden: vrijdag 7 november 2008 16:25
> Aan: Programming forum
> Onderwerp: Re: [Jprogramming] pairs
>
> I executed both lines, having different arguments, several times,
> because I didn't get the same result as RE.Boss timings.
>
> 5j2": (%"1<./) 5&(6!:2)&>'pairi ry';'pair2 ry';'2&comb3 ry'[ry=.1000
> 34.34 1.00 1.04
>
>
> Devon McCormick schreef:
> > This looks like the usual variability of timing few iterations. If you
> try
> > this with 100 iterations, i.e.
> >
> > 5j2": (%"1<./) 100&(6!:2)&>'pair2 ry';'pair3 ry' [ry=.25
> >
> > your results should be more stable.
> >
> > On Fri, Nov 7, 2008 at 9:38 AM, Arie Groeneveld <[EMAIL PROTECTED]>
> wrote:
> >
> >
> >> However....
> >>
> >> Executing the following two lines several times (sometimes I get erratic
> >> results):
> >>
> >> 5j2": (%"1<./) 5&(6!:2)&>'pair2 ry';'pair3 ry' [ry=.25
> >> 1.00 1.34
> >>
> >> 5j2": (%"1<./) 5&(6!:2)&>'pair2 ry';'pair3 ry' [ry=.1000
> >> 1.02 1.00
> >>
> >>
> >> Arie Groeneveld schreef:
> >>
> >>> Slower , but more concise
> >>>
> >>> pair3=:[:;<@({.,.}.)[EMAIL PROTECTED]
> >>>
> >>>
> >>> Arie Groeneveld schreef:
> >>>
> >>>
> >>>> pair2=:([:;],."0 _&.>[:<\.1&+)@i.@<:
> >>>>
> >>>> (pair2-:pairi) 100
> >>>> 1
> >>>>
> >>>>
> >>>>
> >>>>
> >>> ----------------------------------------------------------------------
> >>> For information about J forums see http://www.jsoftware.com/forums.htm
> >>>
> >>>
> >>>
> >> ----------------------------------------------------------------------
> >> For information about J forums see http://www.jsoftware.com/forums.htm
> >>
> >>
> >
> >
> >
> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
> ----------------------------------------------------------------------
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>
--
Devon McCormick, CFA
^me^ at acm.
org is my
preferred e-mail
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