- mars.tensor.sin(x, out=None, where=None, **kwargs)#
Trigonometric sine, element-wise.
x (array_like) – Angle, in radians (\(2 \pi\) rad equals 360 degrees).
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 tensor 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 – The sine of each element of x.
- Return type
The sine is one of the fundamental functions of trigonometry (the mathematical study of triangles). Consider a circle of radius 1 centered on the origin. A ray comes in from the \(+x\) axis, makes an angle at the origin (measured counter-clockwise from that axis), and departs from the origin. The \(y\) coordinate of the outgoing ray’s intersection with the unit circle is the sine of that angle. It ranges from -1 for \(x=3\pi / 2\) to +1 for \(\pi / 2.\) The function has zeroes where the angle is a multiple of \(\pi\). Sines of angles between \(\pi\) and \(2\pi\) are negative. The numerous properties of the sine and related functions are included in any standard trigonometry text.
Print sine of one angle:
>>> import mars.tensor as mt
>>> mt.sin(mt.pi/2.).execute() 1.0
Print sines of an array of angles given in degrees:
>>> mt.sin(mt.array((0., 30., 45., 60., 90.)) * mt.pi / 180. ).execute() array([ 0. , 0.5 , 0.70710678, 0.8660254 , 1. ])
Plot the sine function:
>>> import matplotlib.pylab as plt >>> x = mt.linspace(-mt.pi, mt.pi, 201) >>> plt.plot(x.execute(), mt.sin(x).execute()) >>> plt.xlabel('Angle [rad]') >>> plt.ylabel('sin(x)') >>> plt.axis('tight') >>> plt.show()