Thanks Mike and R.E. Boss! The boolean version ssmb =. +./@E. is what I needed.
The non-boolean ssm=. +/@E. is nice in that it indicates multiple occurrences of the string, though I don't really need it for what I was working on. ]a=. 1 2 3 4 ; 1 2 4 5 6; 1 3 2 5 4 1 ; 2 3 5 1 2 ; 1 2 3 1 2 3 ┌───────┬─────────┬───────────┬─────────┬───────────┐ │1 2 3 4│1 2 4 5 6│1 3 2 5 4 1│2 3 5 1 2│1 2 3 1 2 3│ └───────┴─────────┴───────────┴─────────┴───────────┘ 2 3 ssm"1 >a 1 0 0 1 2 2 3 ssmb"1 >a 1 0 0 1 1 ]b=. 0 1 0 1 0;0 1 1;1 0 1 0 1 0 0 1 0 1 0 0 1;1 0 1 1 0 1 0;0 1 1 1 0;0 1 1 0 1 1 ┌─────────┬─────┬─────────────────────────┬─────────────┬─────────┬───────────┐ │0 1 0 1 0│0 1 1│1 0 1 0 1 0 0 1 0 1 0 0 1│1 0 1 1 0 1 0│0 1 1 1 0│0 1 1 0 1 1│ └─────────┴─────┴─────────────────────────┴─────────────┴─────────┴───────────┘ 1 1 ssm "1 >b 0 1 0 1 2 2 1 1 ssmb "1 >b 0 1 0 1 1 1 However: 0 0 ssm "1 >a 1 0 0 0 0 NB. Wrong! 0 0 ssmb "1 >a 1 0 0 0 0 NB. Wrong! 0 0 ssm "1 >b 8 9 2 6 8 6 NB. Wrong! 0 0 ssmb "1 >b 1 1 1 1 1 1 NB. Wrong! All wrong! So detecting zeros is a problem with this scheme because of J's zero-fill rule.. Skip ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
