Write a code that makes a 2D square array with 20*20 elements. Fill the array with random numbers initially. Then, "draw" a square in the array by adding a value of 4 to those array elements, and plot it with imshow. The square should be centered and have side lengths of 10.

Answer explained below. Python language used

Explanation:

The size of the square is of size 10. So assuming zero indexing,

vertical side1 (column Index = 5) : row index from 5 to 14

vertical side1 (column Index = 14) : row index from 5 to 14

horizontal side1 (row Index = 5) : column index from 5 to 14

horizontal side2 (row Index = 14) : column index from 5 to 14

Note:

while indexing, data_new[a:b, c] denotes,

row index: a to b-1

column index: c

Similarly data_new[a, b:c] denotes,

row index: a

column index: b to c-1

Code:

import matplotlib. pyplot as plt

import numpy as np

size_1 = 20

size_2 = 20

data_new = np. random. random ((size_1, size_2))

data_new[5:15,5] = 4

data_new[5:15,14] = 4

data_new[5,5:15] = 4

data_new[14,5:15] = 4

fig = plt. figure (figsize = (10,10))

plt. imshow (data_new)

plt. colorbar ()

plt. show ()