Dan Bron wrote: > John wrote: >> icol=:(] i. 1:)"1@:|: >> Is there a better way (that avoids the transpose)? > Thanks for the response: I am glad I am not missing anything obvious.
Perhaps you can make a suggestion to avoid how this arises for me, which is in iterating functions on a list of values. For example, here is the Collatz function: collatz=: -:`(>:@(3&*))`1: @. (1&= + 2&|) If I now say (collatz"0)^:(i.10) >:i.20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 1 10 2 16 3 22 4 28 5 34 6 40 7 46 8 52 9 58 10 1 1 5 1 8 10 11 2 14 16 17 3 20 22 23 4 26 28 29 5 1 1 16 1 4 5 34 1 7 8 52 10 10 11 70 2 13 14 88 16 1 1 8 1 2 16 17 1 22 4 26 5 5 34 35 1 40 7 44 8 1 1 4 1 1 8 52 1 11 2 13 16 16 17 106 1 20 22 22 4 1 1 2 1 1 4 26 1 34 1 40 8 8 52 53 1 10 11 11 2 1 1 1 1 1 2 13 1 17 1 20 4 4 26 160 1 5 34 34 1 1 1 1 1 1 1 40 1 52 1 10 2 2 13 80 1 16 17 17 1 1 1 1 1 1 1 20 1 26 1 5 1 1 40 40 1 8 52 52 1 the iterations run down the columns. Best wishes, John ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
