Hi, ;: '999 9 } s' ┌─────┬─┬─┐ │999 9│}│s│ └─────┴─┴─┘
;: '999 (9) } s' ┌───┬─┬─┬─┬─┬─┐ │999│(│9│)│}│s│ └───┴─┴─┴─┴─┴─┘ As demonstrated by using ;: above, the version without parentheses parses 999 9 as a single array. Cheers, Raoul Le lun. 22 juin 2020 à 20:33, HH PackRat <hhpack...@gmail.com> a écrit : > This is based on some exemplary amend code I found somewhere (but > don't remember where): > > ]s=. i.12 > 0 1 2 3 4 5 6 7 8 9 10 11 > > This example of multiple indexes works: > > ]s1=. 999 (1 5 9) } s > 0 999 2 3 4 999 6 7 8 999 10 11 > > but this seemingly simpler version (appearing exactly the same as the > amend form x m} y) does NOT work: > > ]s1=. 999 9 } s ( or: ]s1=. 999 9} s ) > |rank error > | ]s1=. 999 9}s > > However, if the single m value is surrounded by parentheses (which is > nowhere stated in the amend definition x m} y), then it DOES work: > > ]s1=. 999 (9) } s > 0 1 2 3 4 5 6 7 8 999 10 11 > > What am I not understanding here? Thanks for any explanations. > > Harvey > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
