-
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
. nan is returned for nan inputs.For complex inputs, the
sign
function returnssign(x.real) + 0j if x.real != 0 else sign(x.imag) + 0j
.complex(nan, 0) is returned for complex nan inputs.
Parameters: x : array_like
Input values.
Returns: y : ndarray
The sign of
x
.Notes
There is more than one definition of sign in common use for complex numbers. The definition used here is equivalent to which is different from a common alternative, .
Examples
>>> np.sign([-5., 4.5]) array([-1., 1.]) >>> np.sign(0) 0 >>> np.sign(5-2j) (1+0j)
numpy.sign()
2017-01-10 18:18:42
Please login to continue.