sin(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj])
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.
Angle, in radians ( $2 \pi$ rad equals 360 degrees).
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.
This condition is broadcast over the input. At locations where the condition is True, the :None:None:`out` array will be set to the ufunc result. Elsewhere, the :None:None:`out` array will retain its original value. Note that if an uninitialized :None:None:`out` array is created via the default out=None
, locations within it where the condition is False will remain uninitialized.
For other keyword-only arguments, see the ufunc docs <ufuncs.kwargs>
.
Trigonometric sine, element-wise.
Print sine of one angle:
This example is valid syntax, but we were not able to check execution>>> np.sin(np.pi/2.) 1.0
Print sines of an array of angles given in degrees:
This example is valid syntax, but we were not able to check execution>>> np.sin(np.array((0., 30., 45., 60., 90.)) * np.pi / 180. ) array([ 0. , 0.5 , 0.70710678, 0.8660254 , 1. ])
Plot the sine function:
This example is valid syntax, but we were not able to check execution>>> import matplotlib.pylab as pltSee :
... x = np.linspace(-np.pi, np.pi, 201)
... plt.plot(x, np.sin(x))
... plt.xlabel('Angle [rad]')
... plt.ylabel('sin(x)')
... plt.axis('tight')
... plt.show()
The following pages refer to to this document either explicitly or contain code examples using this.
numpy.ma.core.arcsin
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