1. Create a 3x3 matrix with values ranging from 0 to 8
2. Create a 3x3 identity matrix
3. Create a 3x3x3 array with random values
4. Create a random vector of size 30 and find the mean value
5. Create a 5x5 matrix with values 1,2,3,4 just below the diagonal
6. How to sort an array by the nth column?
7. How to find the closest value (to a given scalar) in a vector?
8. Create random vector of size 10 and replace the maximum value by 0
9. How to sum a small array faster than np.sum?
10. Consider the vector [1, 2, 3, 4, 5], how to build a new vector with 3 consecutive zeros interleaved between each value?
11. Consider a large vector Z, compute Z to the power of 3 using 3 different methods and compare execution time
12. How to find the most frequent value in an array?
13. How to swap two rows of an array?