Javascript Program to check if matrix is upper triangular

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.

// Java script  Program to check upper
// triangular matrix.
let N = 4;

// Function to check matrix is in
// upper triangular form or not.
function isUpperTriangularMatrix(mat) {
    for (let i = 1; i < N; i++)
        for (let j = 0; j < i; j++)
            if (mat[i][j] != 0)
                return false;
    return true;
}

// driver function

let mat = [[1, 3, 5, 3],
[0, 4, 6, 2],
[0, 0, 2, 5],
[0, 0, 0, 6]];

if (isUpperTriangularMatrix(mat))
    console.log("Yes");
else
    console.log("No");

// contributed by sravan kumar

Yes

Complexity Analysis:

• 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!

kartik

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Article Tags :

• Matrix
• JavaScript
• Web Technologies
• DSA
• JavaScript-Program

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Practice Tags :

• Matrix