Thanks.
The second solution (preferably in the simpler form 1 ((<"0@,.~ i.@#) {:: ] ) y
) would be admissible for large y, but probably the performance would be poor.
R.E. Boss
-----Original Message-----
From: Programming <[email protected]> On Behalf Of Igor
Zhuravlov
Sent: maandag 20 juli 2020 03:51
To: [email protected]
Subject: Re: [Jprogramming] from vs fetch
NB. x {:: y
((0 ; 1) , (1 ; 1) ,: (2 ; 1)) {:: y
2 4 6
NB. io foo y
1 (((,. <)~ <"0@i.@#) {:: ]) y
2 4 6
Inspired by the last section "To select subarray" in "Common uses" of
https://code.jsoftware.com/wiki/Vocabulary/curlylfcoco#dyadic
--
Regards
Igor
On Sun, Jul 19, 2020 at 7:18 R.E. Boss wrote:
> [...]
> ]y =. 1 2;3 4;5 6 7
> ┌───┬───┬─────┐
> │1 2│3 4│5 6 7│
> └───┴───┴─────┘
> x foo y
> 2 4 6
> [...]
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
