function convertColumnToString(matrix, col) {
const rows = matrix.length;
let result = '';
for (let i = 0; i < rows; i++) {
result += matrix[i][col].toString();
result += ' ';
}
return result.trim();
}
const matrix = [
[ 4, 7, 9, 18, 29, 0],
[ 1, 9, 18, 99, 4, 3],
[ 9, 17, 89, 2, 7, 5],
[19, 49, 6, 1, 9, 8],
[29, 4, 7, 9, 18, 6]
];
const col = 3;
const str = convertColumnToString(matrix, col);
console.log(str);
/*
run:
18 99 2 1 9
*/