3 ms·a = [1 -2] b = [1 - 2] and this is why APL and J use 1 ¯2 or 1 _2 for negative numbersby Avshalom 10y agoa = [1 -2] b = [1 - 2] and this is why APL and J use 1 ¯2 or 1 _2 for negative numbers