numpy.arccos() in Python
Last Updated :
08 Mar, 2024
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
import numpy as np
in_array = [ 0 , 1 , 0.3 , - 1 ]
print ( "Input array : \n" , in_array)
arccos_Values = np.arccos(in_array)
print ( "\nInverse Cosine values : \n" , arccos_Values)
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Output :
Input array :
[0, 1, 0.3, -1]
Inverse Cosine values :
[ 1.57079633 0. 1.26610367 3.14159265]
Code #2 : Graphical representation
import numpy as np
import matplotlib.pyplot as plt
in_array = np.linspace( - np.pi, np.pi, 12 )
out_array1 = np.cos(in_array)
out_array2 = np.arccos(in_array)
print ( "in_array : " , in_array)
print ( "\nout_array with cos : " , out_array1)
print ( "\nout_arraywith arccos : " , out_array1)
plt.plot(in_array, out_array1,
color = 'blue' , marker = "*" )
plt.plot(in_array, out_array2,
color = 'red' , marker = "o" )
plt.title( "blue : numpy.cos() \nred : numpy.arccos()" )
plt.xlabel( "X" )
plt.ylabel( "Y" )
plt.show()
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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)
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