Here is my attempt to explain the difference between conjunctions @: and @ ]A =: 2 3 $ 1 2 3 4 5 6 1 2 3 4 5 6 |. A NB. Reverse matrix A 4 5 6 1 2 3 |."1 A NB. Reverse each row of A (each 1-cell) 3 2 1 6 5 4 |. @: (|."1) A NB. Reverse the result of |."1 A 6 5 4 3 2 1 |. @ (|."1) A NB. Reverse each reversed row of A 1 2 3 4 5 6
In general, f @: (g"r) y means apply f to the result of g"r y and f @ (g"r) y means apply f separately to the results of applying g to each r-cell of y. When r is not specified, the right rank of g is used. You may be able to guess from this what happens when f @: g and f @ g are used dyadically! Kip Murray Sent from my iPad ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
