numpy.tan¶

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

Compute tangent element-wise.

Equivalent tonp.sin(x)/np.cos(x) element-wise.

Parameters:

x : array_like Input array. out : ndarray, None, or tuple of ndarray and None, optional A location into which the result is stored. If provided, it must havea shape that the inputs broadcast to. If not provided orNone,a freshly-allocated array is returned. A tuple (possible only as akeyword 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, valuesof False indicate to leave the value in the output alone. **kwargs For other keyword-only arguments, see theufunc docs.

Returns:

y : ndarray The corresponding tangent values.

Notes

Ifout is provided, the function writes the result into it,and returns a reference toout. (See Examples)

References

M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions.New York, NY: Dover, 1972.

Examples

>>>frommathimportpi>>>np.tan(np.array([-pi,pi/2,pi]))array([  1.22460635e-16,   1.63317787e+16,  -1.22460635e-16])>>>>>># Example of providing the optional output parameter illustrating>>># that what is returned is a reference to said parameter>>>out2=np.cos([0.1],out1)>>>out2isout1True>>>>>># Example of ValueError due to provision of shape mis-matched `out`>>>np.cos(np.zeros((3,3)),np.zeros((2,2)))Traceback (most recent call last):  File"<stdin>", line1, in<module>ValueError:invalid return array shape