numpy.arcsin() in Python
Last Updated :
29 Nov, 2018
numpy.arcsin(x[, out]) = ufunc ‘arcsin’) : This mathematical function helps user to calculate inverse sine for all x(being the array elements).
Parameters :
array : [array_like]elements are in radians.
out : [array_like]array of same shape as x.
Return :
An array with inverse sine 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)
arcsin_Values = np.arcsin(in_array)
print ( "\nInverse Sine values : \n" , arcsin_Values)
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Output :
Input array :
[0, 1, 0.3, -1]
Inverse Sine values :
[ 0. 1.57079633 0.30469265 -1.57079633]
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.sin(in_array)
out_array2 = np.arcsin(in_array)
print ( "in_array : " , in_array)
print ( "\nout_array with sin : " , out_array1)
print ( "\nout_arraywith arcsin : " , 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.sin() \nred : numpy.arcsin()" )
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 sin : [ -1.22464680e-16 -5.40640817e-01 -9.09631995e-01 -9.89821442e-01
-7.55749574e-01 -2.81732557e-01 2.81732557e-01 7.55749574e-01
9.89821442e-01 9.09631995e-01 5.40640817e-01 1.22464680e-16]
out_arraywith arcsin : [ -1.22464680e-16 -5.40640817e-01 -9.09631995e-01 -9.89821442e-01
-7.55749574e-01 -2.81732557e-01 2.81732557e-01 7.55749574e-01
9.89821442e-01 9.09631995e-01 5.40640817e-01 1.22464680e-16]
RuntimeWarning: invalid value encountered in arcsin
out_array2 = np.arcsin(in_array)
References :
https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.arcsin.html#numpy.arcsin
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