I know I can find the location (index) of a specific integer in a vector of integers using I.
I.5=1 2 3 4 5 4 3 4 5 6 5 6 4 8 10 So I want to find the row index of a specific integer in an array of integers: |:1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 3 5 4 1 2 3 4 2 3 4 5 5 4 3 2 2 3 5 4 5=|:1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 3 5 4 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 ,I. 5=|:1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 3 5 4 0 3 0 2 The first zero indicates that there is no 5 in the first row. The second zero gives the index of the 5 in the third row. How can I tell whether the zero is an index, or a null indicator? Skip ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
