Last tweak (I promise) Because the rank of | is 0 0 0 we don't need to specify the rank in the definition of la.
la =: [`]@.(<&|) (la +@|:) A 1 2j3 2j_3 4 Though we do need the parenthesis to separate < from the @. conjunction. Cheers, bob On 2013-01-17, at 12:29 PM, bob therriault wrote: > la =: [`]@.(<&|)"0 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm