For instance I have a matrix like this:
|1 2 3|
|4 5 6|
|7 8 9|
and I need it to convert into a matrix like this:
|1 4 7|
|2 5 8|
|3 6 9|
What is the best and optimal way to achieve this goal?
See article: Transpose An Array In JavaScript and jQuery
function transpose(a) {
// Calculate the width and height of the Array
var w = a.length || 0;
var h = a[0] instanceof Array ? a[0].length : 0;
// In case it is a zero matrix, no transpose routine needed.
if(h === 0 || w === 0) { return []; }
/**
* @var {Number} i Counter
* @var {Number} j Counter
* @var {Array} t Transposed data is stored in this array.
*/
var i, j, t = [];
// Loop through every item in the outer array (height)
for(i=0; i<h; i++) {
// Insert a new row (array)
t[i] = [];
// Loop through every item per item in outer array (width)
for(j=0; j<w; j++) {
// Save transposed data.
t[i][j] = a[j][i];
}
}
return t;
}
console.log(transpose([[1,2,3],[4,5,6],[7,8,9]]));
