cos(x, out=None, where=None, **kwargs)¶
- x : array_like
- Input tensor in radians.
- out : Tensor, None, or tuple of Tensor and None, optional
- A location into which the result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided or None, a freshly-allocated array is returned. A tuple (possible only as a keyword argument) must have length equal to the number of outputs.
- where : array_like, optional
- Values of True indicate to calculate the ufunc at that position, values of False indicate to leave the value in the output alone.
- y : Tensor
- The corresponding cosine values.
If out is provided, the function writes the result into it, and returns a reference to out. (See Examples)
M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions. New York, NY: Dover, 1972.
>>> import mars.tensor as mt
>>> mt.cos(mt.array([0, mt.pi/2, mt.pi])).execute() array([ 1.00000000e+00, 6.12303177e-17, -1.00000000e+00]) >>> >>> # Example of providing the optional output parameter >>> out1 = mt.empty(1) >>> out2 = mt.cos([0.1], out1) >>> out2 is out1 True >>> >>> # Example of ValueError due to provision of shape mis-matched `out` >>> mt.cos(mt.zeros((3,3)),mt.zeros((2,2))) Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: operands could not be broadcast together with shapes (3,3) (2,2)