Convert angles from degrees to radians for all elements in a given NumPy array

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: