numpy.sin¶

numpy.sin(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj]) = <ufunc 'sin'>¶

Trigonometric sine, element-wise.

Parameters

xarray_like

Angle, in radians (

System Message: WARNING/2 (2 \pi)

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rad equals 360 degrees).

outndarray, None, or tuple of ndarray 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.

wherearray_like, optional

This condition is broadcast over the input. At locations where the condition is True, the out array will be set to the ufunc result. Elsewhere, the out array will retain its original value. Note that if an uninitialized out array is created via the default out=None, locations within it where the condition is False will remain uninitialized.

**kwargs

For other keyword-only arguments, see the ufunc docs.

Returns

yarray_like: The sine of each element of x. This is a scalar if x is a scalar.

See also

arcsin, sinh, cos

Notes

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

System Message: WARNING/2 (+x)

axis, makes an angle at the origin (measured counter-clockwise from that axis), and departs from the origin. The

System Message: WARNING/2 (y)

coordinate of the outgoing ray’s intersection with the unit circle is the sine of that angle. It ranges from -1 for

System Message: WARNING/2 (x=3\pi / 2)

to +1 for

System Message: WARNING/2 (\pi / 2.)

The function has zeroes where the angle is a multiple of

System Message: WARNING/2 (\pi)

. Sines of angles between

System Message: WARNING/2 (\pi)

and

System Message: WARNING/2 (2\pi)

are negative. The numerous properties of the sine and related functions are included in any standard trigonometry text.

Examples

Print sine of one angle:

>>> np.sin(np.pi/2.)
1.0

Print sines of an array of angles given in degrees:

>>> 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:

>>> import matplotlib.pylab as plt
>>> 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()

Mathematical functions numpy.cos

numpy.sin¶

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