Two-argument form See also one-argument form Negate
Subtracts the number(s) in the right-hand argument from the number(s) in the left-hand argument:
240-1 (Subtracts one number from another) 239 8 4 6-1 0 2 (Subtracts each number in a vector from 7 4 4 the corresponding number in a vector of equal size) 22 ¯4 15-1 (Subtracts 1 from each number in a 21 ¯5 14 vector of numbers) TABLE „ 3 3 ½ ¼ 9 100-TABLE (Subtracts each number in a matrix 99 98 97 from a scalar) 96 95 94 93 92 91 TABLE-TABLE (Subtracts each number in a matrix 0 0 0 from the corresponding number in a 0 0 0 matrix of equal size and dimensions) 0 0 0 1 - 5 (2 2 ½¼4) (¼5) (Each element in the right argument is ¯4 0 ¯1 0 ¯1 ¯2 ¯3 ¯4 subtracted from 1) ¯2 ¯3 2 3-5 (2 2 ½¼4) (¼5) (Arguments must be the same length) LENGTH ERROR 2 3-5(2 2½¼4)(¼5) ^ (2 2½¼4) 10 (5½3)-5 (2 2 ½¼4) (¼5) ¯4 ¯3 9 8 2 1 0 ¯1 ¯2 (Corresponding elements subtracted) ¯2 ¯1 7 6
Note: Remember that APL uses a special symbol (the high minus ¯) to indicate negative numbers. You will see some examples above.