20.01.2020 9:10, Ben Gorte:
v i } 1$.3 4;0 1;0 NB. amend an 'empty' sparse matrix |index error | v i}1$.3 4;0 1;0
Amend working for 1-dimensional sparse arrays y =. 0 0 0 5 0 0 0 9 ] u =. $. y u 3 │ 5 7 │ 9 5 (1)} u 1 │ 5 3 │ 5 7 │ 9 For two dimensional is possible amend only whole row. (1 2 3 4) (0) } 1$.3 4;0 1;0 0 0 │ 1 0 1 │ 2 0 2 │ 3 0 3 │ 4 Sergey. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
