Replace Elements with Zeros
Given a MxN matrix, write a program to replace all elements that do not belong to principal-diagonal & anti-diagonal with Zeros.
Principal-diagonal elements are the set of elements of a matrix that lie on the line joining the top left corner to the bottom right corner.
Anti-diagonal elements are the set of elements of a matrix that lie on the line joining the bottom left corner to the top right corner.Input
The first line of input will contain two space-separated integers, denoting MxN matrix.
The next M lines will contain N space-separated integers.Output
The output should be MxN matrix by replacing elements that do not belong to principal-diagonal and anti-diagonal with Zeros. Print each row as a space separated integers in a single line.Explanation
For example if the M and N are 5 and 5. Read the elements of 5 rows in next 5 lines. If the given elements are
def print_1[mat, n, m]:
for i in range[n]:
for j in range[m]:
print[mat[i][j], end=" "]
print[]
def makediagonalnotzero[mat, n, m]:
for i in range[n]:
for j in range[m]:
# right and left diagonal condition
if [i == j or [i + j + 1] == n]:
[mat[i][j]]
else:
mat[i][j] = 0
# print resultant matrix
print_1[mat, n, m]
# Driver code
if __name__ == "__main__":
n = 3
m = 3
mat = [[2, 1, 7],
[3, 7, 2],
[5, 4, 9]]
makediagonalnotzero[mat, n, m]
Harry August 23, 2022 Today, we will see how to replace elements with zeros in Python. We will write two programs for that, in the first one, we will see how to replace elements with zeros in a matrix created using lists in Python, and in the second one, we will
use NumPy. Also Read:1. Replace Elements with Zeros in a matrix of List in Python
matrix = [[1, 2, 3],
[4, 5, 6],
[7, 8, 9]]
for i in range[len[matrix]]:
for j in range[len[matrix]]:
matrix[i][j] = 0
print[matrix]Output:
2. Replace Elements with Zeros in a matrix of List in Python
import numpy as np
matrix = np.array[[[1, 2, 3],
[4, 5, 6],
[7, 8, 9]]]
for i in range[len[matrix]]:
for j in range[len[matrix]]:
matrix[i][j] = 0
print[matrix]Output:
Author: Harry
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