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If Y is complex, R is Y with the imaginary part of all elements negated.

If Y is real or non-numeric, R is the same array unchanged, although ⊣ is faster. See Same.

Examples

      +3j4
3J¯4
      +1j2 2j3 3j4
1J¯2 2J¯3 3J¯4
 
      3j4++3j4
6
      3j4×+3j4
25
 
      +A←⍳5
1 2 3 4 5
 
      +⎕EX'A'
1