The code below takes in a matrix (MAT) and transposes the matrix, calls it array. The definition of the symmetrical matrix is that it should be a square matrix and the elements in the given matrix compared to the transposed one should be the same.
The given matrix below and transposed matrix should output false if checked for symmetry.
I did create an if statement at first to check whether MAT[j][i] and array[j][i] are the same but keep getting the wrong answer. It's not properly checking all the elements together. Could someone help with that?
Thanks!
const symmetricMatrix = function (MAT) {
let array = [];
for (let i = 0; i < MAT.length; i++) {
array.push([]);
for (let j = 0; j < MAT.length; j++) {
array[i].push(MAT[j][i]);
}
}
return array;
};
console.log(
symmetricMatrix(
(MAT = [
[1, 3, 1],
[-1, 1, 4],
[2, 1, 0],
])
)
);First you can create a copy of matrix and then transpose it and then check if it has same element at that index.
const symmetricMatrix = function (mat) {
const copy = Array.from(mat, (_) => []);
for (let i = 0; i < mat.length; i++)
for (let j = 0; j < mat.length; j++)
copy[i][j] = mat[j][i];
for (let i = 0; i < mat.length; i++)
for (let j = 0; j < mat.length; j++)
if (copy[i][j] != mat[i][j]) return false;
return true;
};
const matrix = [
[1, 3, 1],
[-1, 1, 4],
[2, 1, 0],
];
const matrix2 = [
[1, -1, 2],
[-1, 1, 1],
[2, 1, 0],
];
console.log(symmetricMatrix(matrix));
console.log(symmetricMatrix(matrix2));