numpy.signbit — NumPy v1.11 Manual (original) (raw)
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. |
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| 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)