Python Program to check if matrix is upper triangular Last Updated : 10 Jun, 2022 Comments Improve Suggest changes Like Article Like Report 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 # Python3 Program to check upper # triangular matrix. # Function to check matrix # is in upper triangular 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 # Driver function. 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") # This code is contributed by Anurag Rawat 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. Please refer complete article on Program to check if matrix is upper triangular for more details! Comment More infoAdvertise with us Next Article Python Program to check if matrix is upper triangular kartik Follow Improve Article Tags : Misc Matrix Python Python Programs School Programming DSA +2 More Practice Tags : MatrixMiscpython Similar Reads Python Program to check if matrix is lower triangular Given a square matrix and the task is to check the matrix is in lower triangular form or not. A square matrix is called lower triangular if all the entries above the main diagonal are zero. 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