names=imag,imaginary
visibility=public
kind=defined

--- imaginary -> Matrix
--- imag -> Matrix

行列の虚部を返します。

  Matrix[[Complex(1,2), Complex(0,1), 0], [1, 2, 3]]
  #  => 1+2i  i  0
  #        1  2  3
  Matrix[[Complex(1,2), Complex(0,1), 0], [1, 2, 3]].imaginary
  #  =>   2i  i  0
  #        0  0  0
