names=real
visibility=public
kind=defined

--- real -> Matrix

行列の実部を返します。

  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]].real
  #  =>    1  0  0
  #        1  2  3

