Python Program to check if matrix is upper triangular
Last Updated :
10 Jun, 2022
Given a square matrix and the task is to check the matrix is in upper triangular form or not. A square matrix is called upper triangular if all the entries below the main diagonal are zero.
Examples:
Input : mat[4][4] = {{1, 3, 5, 3},
{0, 4, 6, 2},
{0, 0, 2, 5},
{0, 0, 0, 6}};
Output : Matrix is in Upper Triangular form.
Input : mat[4][4] = {{5, 6, 3, 6},
{0, 4, 6, 6},
{1, 0, 8, 5},
{0, 1, 0, 6}};
Output : Matrix is not in Upper Triangular form.
Python3
def isuppertriangular(M):
for i in range ( 1 , len (M)):
for j in range ( 0 , i):
if (M[i][j] ! = 0 ):
return False
return True
M = [[ 1 , 3 , 5 , 3 ],
[ 0 , 4 , 6 , 2 ],
[ 0 , 0 , 2 , 5 ],
[ 0 , 0 , 0 , 6 ]]
if isuppertriangular(M):
print ( "Yes" )
else :
print ( "No" )
|
Output:
Yes
Time Complexity: O(n2), where n represents the number of rows and columns of the matrix.
Auxiliary Space: O(1), no extra space is required, so it is a constant.
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