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Convert angles from degrees to radians for all elements in a given NumPy array
  • Last Updated : 29 Aug, 2020

Angles can be expressed in both degrees and radians. In this article, we will know about the approaches and methods to convert degrees to radians.

Method #1 : Using radians()

This method takes an array as an input parameter and returns an array that has radian values.

Python




# python code demonstrating usage of radians
# method to convert degrees to radians
# importing numpy library
import numpy as np
import math
  
  
# initialising an array
array=np.arange(20.)*90
  
# printing degree values
print('Values of array in Degrees:',array)
  
# converting to radians
radian_array=np.radians(array)
  
# printing radian values
print('Values of array in radians:',radian_array)

Output:



Method #2: Using deg2rad()

This method takes input array and returns an array that has radian values the same as the size of the input array.

Python3




# python code demonstrating usage of radians
# method to convert degrees to radians
# importing numpy library
import numpy as np
import math
  
# initialising an array
array=np.arange(20.)*90
  
# printing degree values
print('Values of array in Degrees:',array)
  
# converting to radians
radian_array=np.deg2rad(array)
  
# printing radian values
print('Values of array in radians:',radian_array)

Output:

Method 3: Using Formula

Python3




# python code demonstrating usage of radians
# method to convert degrees to radians
# importing numpy library
import numpy as np
import math
  
# initialising an array
array=np.arange(20.)*90
  
# printing degree values
print('Values of array in Degrees:',array)
radian_array=[]
  
# converting to radians
for i in array:
    radian_array.append(i*math.pi/180)
  
# printing radian values
print('Values of array in radians:',radian_array)

Output:

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