Question

need help with this python progam using numpy

Create a 4x4 two dimensional array with numbers from 1 thru 16.

show this then:

Change the last element by dividing it in half. Show that the original array has changed.

show this then:

Set all values in row 2 to zero. Show the original array contains this change

show this then:

Set all values in column 1 to one. Shoe the original array contains this change.

show this then:

Display the product of the first and third columns.

show this then:

Display the sum of the first and second rows.

then do:

Set the 4 elements in the center of the array to 99 and display the original data to show the change.

Answer 1

Here is code:

import numpy as np

rows = 4

cols = 4

# Create a 4x4 two dimensional array with numbers from 1 thru 16.

a = np.zeros((rows, cols))

counter = 1

for i in range(0, rows):

for j in range(0, cols):

a[i][j] = counter

counter += 1

print(a)

# Change the last element by dividing it in half. Show that the original array has changed.

print("\nChange the last element by dividing it in half.")

a[rows-1][cols - 1] /= 2

print(a)

# Set all values in row 2 to zero. Show the original array contains this change

print("\nSet all values in row 2 to zero.")

for i in range(0, cols):

a[2][i] = 0

print(a)

# Set all values in column 1 to one. Shoe the original array contains this change.

print("\nSet all values in column 1 to one.")

for i in range(0, rows):

a[i][1] = 0

print(a)

# Display the product of the first and third columns.

print("\nthe product of the first and third columns.")

for i in range(0, rows):

print(a[i][0] * a[i][2])

# Display the sum of the first and second rows.

print("\nthe sum of the first and second rows.")

for i in range(0, cols):

print(a[0][i] * a[1][i])

# Set the 4 elements in the center of the array to 99 and display the original data to show the change.

print("\nSet the 4 elements in the center of the array to 99.")

a[1][1] = 99

a[1][2] = 99

a[2][1] = 99

a[2][2] = 99

print(a)

Output: