1. What is the output of the following code?

import numpy as np
a = np.array([1, 2, 3])
b = a + 1
a[0] = 99
print(b[0])

2. Which of the following functions creates an array with random values between 0 and 1?
A) np.random.randint()
B) np.random.randn()
C) np.random.rand()
D) np.random.choice()

3. Write a function that takes a 2D NumPy array and returns the sum of all elements in each row.

4. What will be printed by this code?

import numpy as np
x = np.array([1, 2, 3])
y = x.view()
y[0] = 5
print(x)

5. Explain the difference between np.copy() and np.view().

6. How do you efficiently reshape a 1D array of 100 elements into a 10x10 matrix?

7. What is the result of np.dot(np.array([1, 2]), np.array([[1], [2]]))?

8. Write a program to generate a 3D array of shape (2, 3, 4) filled with random integers between 0 and 9.

9. What happens when you use np.concatenate() on arrays with incompatible shapes?

10. Which method can be used to find the indices of non-zero elements in a NumPy array?

11. What is the output of this code?

import numpy as np
arr = np.arange(10)
result = arr[arr % 2 == 0]
print(result)

12. Describe how broadcasting works in NumPy with an example.

13. Write a function that normalizes each column of a 2D NumPy array using z-score normalization.

14. What is the purpose of np.fromfunction() and how would you use it to create a 3x3 array where each element is the sum of its indices?

15. What does np.isclose(a, b) return and when is it preferred over ==?

16. How would you perform element-wise multiplication of two arrays of different shapes using broadcasting?

17. Write a program to compute the dot product of two large 2D arrays without using loops.

18. What is the difference between np.array() and np.asarray()?

19. How can you efficiently remove duplicate rows from a 2D NumPy array?

20. Explain the use of np.einsum() and provide an example for computing the trace of a matrix.

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By: @DataScienceQ 🚀