numpy.sign()
numpy.sign
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numpy.sign(x[, out]) =
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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.
Returns: y : ndarray
The sign of
x
.Examples
>>> np.sign([-5., 4.5]) array([-1., 1.]) >>> np.sign(0) 0
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https://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.sign.html