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# numpy.arctan () in Python

Parameters :

`  array:  [array_like] elements are in radians.  out:  [array_like] array of same shape as x. `

Note:

2pi Radians = 360 degrees
The convention is to return the angle z whose real part lies in [- pi / 2, pi / 2].

Return:

` An array with inverse tangent of x for all x ie array elements. The values ​​are in the closed interval [-pi / 2, pi / 2]. `

Code # 1: Work

 ` # Python program explaining ` ` # arctan () function `   ` import ` ` numpy as np ` ` `  ` in_array ` ` = ` ` [` ` 0 ` `, ` ` 1 ` `, ` ` 0.3 ` `, ` ` - ` ` 1 ` ` ] ` ` print ` ` (` ` "Input array: "` `, in_array) ` ` `  ` arctan_Values ​​` ` = ` ` np.arctan (in_array ) ` ` print ` ` (` ` "Inverse Tangent values : "` `, ` ` ` ` arctan_Values) `

Output:

` Input array: [0, 1, 0.3, -1] Inverse Tangent values: [0. 0.78539816 0.29145679 -0.78539816] `

Code # 2: Graphical representation

 ` # Show Python program ` ` # Graphical view ` ` # arctan () functions `   ` import ` ` numpy as np ` ` import ` ` matplotlib.pyplot as plt `   ` in_array ` ` = ` ` np.linspace (` ` - ` ` np.pi, np.pi, ` ` 12 ` `) ` ` out_array1 ` ` = ` ` np.tan (in_array) ` ` out_array2 ` ` = ` ` np.arctan (in_array) `   ` print ` ` (` ` "in_array:" ` `, in_array) ` ` print ` ` (` ` "out_array with tan:" ` `, out_ar ray1) ` ` print ` ` (` ` "out_arraywith arctan : "` `, out_array1) ` ` `  ` # red for numpy.arccos () ` ` plt.plot (in_array, out_array1, ` ` color ` ` = ` ` ’blue’ ` `, marker ` ` = ` ` "*" ` ` ) `   ` plt.plot (in_array, out_array2, ` ` color ` ` = ` `’ red’ ` `, marker ` ` = ` ` "o" ` `) `   ` plt.title (` ` "blue: numpy.tan () red: numpy.arctan ()" ` `) ` ` plt.xlabel (` ` "X" ` `) ` ` plt.ylabel (` ` "Y" ` `) ` ` plt.show () `

Output:

` in_array: [-3.14159265 -2.57039399 -1.99919533 -1.42799666 -0.856798 -0.28559933 0.28559933 0.856798 1.42799666 1.99919533 2.57039399 3.14159265] out_array with tan6.4680 01 2.18969456e + 00 -6.95515277e + 00 -1.15406152e + 00 -2.93626493e-01 2.93626493e-01 1.15406152e + 00 6.95515277e + 00 -2.18969456e + 00 -6.42660977e-01 -1.22464680e-16] out_array : [1.22464680e-16 6.42660977e-01 2.18969456e + 00 -6.95515277e + 00 -1.15406152e + 00 -2.93 626493e-01 2.93626493e-01 1.15406152e + 00 6.95515277e + 00 -2.18969456e + 00 -6.42660977e-01 -1.22464680e-16] `

arcsin.html#numpy.arccos>https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.arcsin. html # numpy.arccos
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