Hello Suppose there is a 2d matrix m(sized as row, col) and a verb f. What I want is the elements at column c are replaced with the result of f c, that is each element is replaced with its result of f. The result should be the same shape of m, only the column amended.
For example, m=: ?4 4$ 10 m 0 6 3 2 9 1 7 3 5 2 9 5 4 0 9 0 f=:+: (f amendcol 2) m 0 6 6 2 9 1 14 3 5 2 18 5 4 0 18 0 What is the easiest way? BTW, it doesn't have to follow the form of the former example; it's just to convey the concept. June ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
