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

Last update on August 29 2025 12:44:53 (UTC/GMT +8 hours)

24. Convert Degrees to Radians

Write a NumPy program to convert angles from degrees to radians for all elements in a given array.

Sample Input: Input: [-180., -90., 90., 180.]

Sample Solution:

Python Code:

# Importing the NumPy library
import numpy as np

# Creating an array of angles in degrees: [-180, -90, 90, 180]
x = np.array([-180., -90., 90., 180.])

# Converting angles from degrees to radians using np.radians()
r1 = np.radians(x)

# Converting angles from degrees to radians using np.deg2rad()
r2 = np.deg2rad(x)

# Checking if the results from np.radians() and np.deg2rad() are equivalent
assert np.array_equiv(r1, r2)

# Printing the converted angles in radians
print(r1)

Sample Output:

[-3.14159265 -1.57079633  1.57079633  3.14159265]

Explanation:

x = np.array([-180., -90., 90., 180.]): This code defines a numpy array x containing the angles in degrees represented in floating-point format.

r1 = np.radians(x): The np.radians(x) function takes an input array x that contains angles in degrees and returns an array of the same shape with the corresponding angles in radians. The result is stored in r1.

r2 = np.deg2rad(x): The np.deg2rad(x) function also performs the same conversion but is an alternative function name for np.radians().The result is stored in r2.

np.array_equiv(r1, r2): Finally, the np.array_equiv() function is used to verify that r1 and r2 have the same values, which should always be true since they represent the same conversion.

For more Practice: Solve these Related Problems:

Implement a function that converts an array of degree values to radians using np.radians.
Test the conversion on arrays with extreme values and verify the accuracy of the results.
Create a solution that handles both 1D and 2D arrays, ensuring the output shape matches the input.
Compare the results of np.radians with a manual conversion (multiplying by π/180) to validate precision.

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