-
numpy.cos(x[, out]) =
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Cosine element-wise.
Parameters: x : array_like
Input array in radians.
out : ndarray, optional
Output array of same shape as
x
.Returns: y : ndarray
The corresponding cosine values.
Raises: ValueError: invalid return array shape
if
out
is provided andout.shape
!=x.shape
(See Examples)Notes
If
out
is provided, the function writes the result into it, and returns a reference toout
. (See Examples)References
M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions. New York, NY: Dover, 1972.
Examples
>>> np.cos(np.array([0, np.pi/2, np.pi])) array([ 1.00000000e+00, 6.12303177e-17, -1.00000000e+00]) >>> >>> # Example of providing the optional output parameter >>> out2 = np.cos([0.1], out1) >>> out2 is out1 True >>> >>> # Example of ValueError due to provision of shape mis-matched `out` >>> np.cos(np.zeros((3,3)),np.zeros((2,2))) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: invalid return array shape
numpy.cos()
2017-01-10 18:13:32
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