This is documentation for an old release of NumPy (version 1.3.). Read this page Search for this page in the documentation of the latest stable release (version > 1.17).
numpy.sign
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numpy.sign(x[, out])
Returns an element-wise indication of the sign of a number.
The sign function returns -1 if x < 0, 0 if x==0, 1 if x > 0.
Parameters: | x : array_like
Input values.
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Returns: | y : ndarray
The sign of x.
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Examples
>>> np.sign([-5., 4.5])
array([-1., 1.])
>>> np.sign(0)
0