For the sake of completeness:
1 3 {:: i. 4 4
7
] s=.> 1 3; 2 1
1 3
2 1
s {:: i. 4 4
7 9
On May 29, 2014 8:18 AM, "Alex Giannakopoulos" <[email protected]>
wrote:
> Hm, nice that, especially the intersection feature
>
> (<2 1;1 3) { i. 4 4 NB. Select rows 2&1, columns 1&3
> 9 11
> 5 7
>
> Maybe it's time that NewVoc was linked to the Help page in place of Voc.
>
> Certainly would have saved me a lot of time on more than one occasion.
>
> Will certainly be checking that first from now on...
>
>
>
>
>
>
> On 29 May 2014 12:09, Henry Rich <[email protected]> wrote:
>
> > It's in NuVoc:
> >
> > http://www.jsoftware.com/jwiki/Vocabulary/curlylf#dyadic
> >
> > Henry Rich
> >
> >
> > On 5/29/2014 6:44 AM, alexgian wrote:
> >
> >> Oops, scratch that, just saw it.
> >>
> >>
> >> On 29 May 2014 11:39, alexgian <[email protected]> wrote:
> >>
> >> Thanking you kindly, sir, that's a relief!
> >>> Seems to work at all ranks, too.
> >>> I don't think it's in the Voc (under { ), or my eyesight is getting
> >>> really
> >>> bad. Should be, IMHO, fairly crucial thing for an array-programming
> >>> language.
> >>>
> >>>
> >>>
> >>> On 29 May 2014 11:23, Kip Murray <[email protected]> wrote:
> >>>
> >>> i. 4 4
> >>>> 0 1 2 3
> >>>> 4 5 6 7
> >>>> 8 9 10 11
> >>>> 12 13 14 15
> >>>> (<2 1) { i. 4 4
> >>>> 9
> >>>>
> >>>>
> >>>> On Thursday, May 29, 2014, alexgian <[email protected]>
> wrote:
> >>>>
> >>>> If I want to index into a (rank 2) array to get the element usually
> >>>>>
> >>>> called
> >>>>
> >>>>> the (i,j)th in the big, bad world, is there a better way to do it
> than
> >>>>> this, which I currently use?
> >>>>>
> >>>>> idx =: (1 { [) { ] {~ 0 { [
> >>>>>
> >>>>> 2 1 idx 4 4 $i.16
> >>>>>
> >>>>> 9
> >>>>>
> >>>>> I notice that if { takes an array as left arg, it merely returns the
> >>>>>
> >>>> given
> >>>>
> >>>>> rows of that array, rather than the required indexed element.
> >>>>> So I can't do, for instance, (2 1) { 4 4 $i.16 and get what I want
> >>>>> Furher, I wander if there is a more generic way of writing this so
> that
> >>>>>
> >>>> it
> >>>>
> >>>>> would work automatically for rank-3 arrays and greater.
> >>>>>
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> >>>>>
> >>>>>
> >>>>
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> >>>
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