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# numpy.signbit

`numpy.``signbit`(x[, out]) = <ufunc 'signbit'>

  Returns element-wise True where signbit is set (less than zero).

  Parameters: | x : array_like The input value(s). out : ndarray, optional Array into which the output is placed. Its type is preserved and it must be of the right shape to hold the output. See `doc.ufuncs`.
  Returns: | result : ndarray of bool Output array, or reference to out if that was supplied.

  Examples

      >>> np.signbit(-1.2)
      True
      >>> np.signbit(np.array([1, -2.3, 2.1]))
      array([False,  True, False], dtype=bool)