numpy.cos — NumPy v1.11 Manual (original) (raw)
numpy.cos(_x_[, _out_]) = <ufunc 'cos'>¶
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 and out.shape != x.shape (See Examples) |
Notes
If out is provided, the function writes the result into it, and returns a reference to out. (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
outnp.cos(np.zeros((3,3)),np.zeros((2,2))) Traceback (most recent call last): File "", line 1, in ValueError: invalid return array shape