's e i'=. 5 8 0.25
i (],(+{:))^:((e-i)>:{:@])^:_ s
5 5.25 5.5 5.75 6 6.25 6.5 6.75 7 7.25 7.5 7.75 8
i=.0.27
i (],(+{:))^:((e-i)>:{:@])^:_ s
5 5.27 5.54 5.81 6.08 6.35 6.62 6.89 7.16 7.43 7.7 7.97
I'm no 'tacitus', so that part I leave to the reader.
R.E. Boss
> -----Oorspronkelijk bericht-----
> Van: programming-boun...@forums.jsoftware.com
> [mailto:programming-boun...@forums.jsoftware.com] Namens Raul Miller
> Verzonden: donderdag 23 augustus 2012 20:57
> Aan: programm...@jsoftware.com
> Onderwerp: Re: [Jprogramming] Generating a sequence
>
> On Thu, Aug 23, 2012 at 12:34 PM, Skip Cave <s...@caveconsulting.com> wrote:
> > What I was trying to do was emulate a standard sequence function in Octave
> > which has the following syntax:
> >>> e:i:s
> > ans = 5.00000 5.25000 5.50000 5.75000 6.00000 6.25000 6.50000 6.75000
> > 7.00000 7.25000 7.50000 7.75000 8.00000
> >
> > In our Machine Learning homework we use this sequence-generating function
> > often, so I thought I would see if I could duplicate the function in J.
> > However, to fit J's dyadic syntax, I put s & e as the left argument of the
> > function, and the increment i as the right argument. If you feel that there
> > is a better way to place the three args around the dyadic function, feel
> > free to propose that.
>
> If you are trying to duplicate the Octave mechanism, I would preserve
> the relative argument order that Octave uses, in other words one of
> these:
> seqmonad e,i,s
> e seqdyad i,s
> (e,i) seqdyad s
> e i seqadverb s
>
> If I expected to frequently be using literal numeric arguments, I
> would probably go with the first version. Perhaps:
>
> seq=: [: +`(*i.)/ _1&}. , 1 <.@+ 1&{ %~ {:-{.
>
> seq 5 0.25 8
> 5 5.25 5.5 5.75 6 6.25 6.5 6.75 7 7.25 7.5 7.75 8
>
> FYI,
>
> --
> Raul
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