Hi, does this help :
5 e."1 |:1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 3 5 4 0 1 1 1 On Sun, Jan 13, 2019 at 12:56 PM 'Skip Cave' via Programming < [email protected]> wrote: > 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 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
