<"1 &. |: i. 5 3 ┌──────────┬───────────┬───────────┐ │0 3 6 9 12│1 4 7 10 13│2 5 8 11 14│ └──────────┴───────────┴───────────┘
(3) (2)} L:0 <"1 &. |: i. 5 3 ┌──────────┬───────────┬───────────┐ │0 3 3 9 12│1 4 3 10 13│2 5 3 11 14│ └──────────┴───────────┴───────────┘ but: (3) (2)} L:0 (1}) |: <"1 |: i. 5 3 ┌───────────┐ │1 4 3 10 13│ └───────────┘ updates (and returns) just the middle cell instead of returning the whole data. I would have hoped that the right approach was: 3 [L:0(2})`1:`]} |: <"1 |: i. 5 3 ┌─┐ │3│ └─┘ but no. ----- Original Message ----- From: Pascal Jasmin <[email protected]> To: "[email protected]" <[email protected]> Cc: Sent: Thursday, September 19, 2013 12:02:43 PM Subject: [Jprogramming] Amend trickiness 6 (3}"1) i.4 5 0 1 2 6 4 5 6 7 6 9 10 11 12 6 14 15 16 17 6 19 +: (3}"1) i.4 5 6 16 26 36 I'd wish for the result to return the full row/table as the first amend. I'd also like the code to the left of the amend to not know how many rows there are. There is possibly a gerund approach I don't understand I've read this page http://www.jsoftware.com/jwiki/JPhrases/MergeAmend and it recommends making an unravelling adverb, and then applying a known shape (ur 2_3) to select, but basically the general workaround approach that seems to be recommended. IR=: @(i.@$@]) new=. +: 3{"1 ] i.4 5 or to add rows 1 and 2 ((0&{+1&{))"1 sel=. 3&{"1 IR i.4 5 rows =. # i.4 5 then to do the update, (rows , 5) $ new sel} , i.4 5 to avoid (rows , 5) $ (+:@(3&{)"1 sel} ,) i. 4 5 4 5 $ (+:@(3&{)"1 sel} ,) i. 4 5 0 1 2 6 4 5 6 7 16 9 10 11 12 26 14 15 16 17 36 19 is there a gerund amend version that avoids the temp assignments? or other code to get the same result? ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
