Hello, Is there an easier(and more general) way of doing "skipping prefix"? With "skipping prefix", I mean the start point of each group could be 1 or greater.
sp=:1 : 'u&> ((1 0 $~ #) # ]) 3 <\ y' <sp i.10 +-----+-----+-----+-----+ |0 1 2|2 3 4|4 5 6|6 7 8| +-----+-----+-----+-----+ +/sp i.10 3 9 15 21 Maybe, "2 3 u sp y" is better, which moves the start point of each group by 2 and the size of the group is 3. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
