// matrixUtils.js
// Function to print a matrix
function printMatrix(matrix) {
const rows = matrix.length; // number of rows
const cols = matrix[0].length; // number of columns
for (let i = 0; i < rows; i++) {
let row = '';
for (let j = 0; j < cols; j++) {
row += matrix[i][j].toString().padStart(4);
}
console.log(row);
}
}
// Function to invert a matrix (reverse order of elements)
function inverseMatrix(matrix) {
const rows = matrix.length;
const cols = matrix[0].length;
let counter = 0;
for (let i = 0, r = rows - 1; i < rows; i++, r--) {
for (let j = 0, c = cols - 1; j < cols; j++, c--) {
[matrix[i][j], matrix[r][c]] = [matrix[r][c], matrix[i][j]];
counter++;
if (counter > (rows * cols) / 2 - 1) return;
}
}
}
// Export functions so they can be reused in other files
//module.exports = { printMatrix, inverseMatrix };
// index.js
//const { printMatrix, inverseMatrix } = require('./matrixUtils');
const matrix = [
[1, 2, 3, 4, 18],
[5, 6, 7, 8, 21],
[12, 0, 15, 30, 100]
];
console.log('matrix:');
printMatrix(matrix);
inverseMatrix(matrix);
console.log('\ninverse matrix:');
printMatrix(matrix);
/*
run:
matrix:
1 2 3 4 18
5 6 7 8 21
12 0 15 30 100
inverse matrix:
100 30 15 0 12
21 8 7 6 5
18 4 3 2 1
*/
