numpy.arccos() in Python

numpy.arccos(x[, out]) = ufunc 'arccos') : This mathematical function helps user to calculate inverse cos for all x(being the array elements). 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 [0, pi].

Return :

An array with inverse cosine of x 
for all x i.e. array elements. 

The values are in the closed interval [-pi/2, pi/2].

  Code #1 : Working Output :

Input array : 
 [0, 1, 0.3, -1]

Inverse Cosine values : 
 [ 1.57079633 0. 1.26610367 3.14159265]

  Code #2 : Graphical representation

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 cos : [-1. -0.84125353 -0.41541501 0.14231484 0.65486073 0.95949297
 0.95949297 0.65486073 0.14231484 -0.41541501 -0.84125353 -1. ]

out_arraywith arccos : [-1. -0.84125353 -0.41541501 0.14231484 0.65486073 0.95949297
 0.95949297 0.65486073 0.14231484 -0.41541501 -0.84125353 -1. ]
RuntimeWarning: invalid value encountered in arccos
 out_array1 = np.sin(in_array)

👁 Image