column wise array to row wise array using javascript

Question

i have three array column wise using which i am trying to create array row wise using java-script like this. Do i need to traverse through complete data?

what i have 

var a=new Array("1","2","3","4");

var b=new Array("5","6","7","8");

var c=new Array("9","10","11","12");


what i want to create using the above array

var d=new Array("1","5","9");

var e=new Array("2","6","10");

var f=new Array("3","7","11");

var g=new Array("4","8","12");

nitish712 · Accepted Answer · 2014-02-13 13:30:25Z

1

If you are denoting each array by different variable names, then the task becomes tedious. On the other hand, if you store them in a single 2-Dimensional array it can be accomplished easily.

Say the first array is alternatively declared as follows:

var total_array = new Array(
                   new Array("1","2","3","4"),
                   new Array("5","6","7","8"),
                   new Array("9","10","11","12")
                  );

Now you can use a simple for loop to store the contents in a new 2d array column wise.

var new_array = new Array(4);
for(var i=0; i<4; i++)
      new_array[i] = new Array(3);

//now copy the contents...

for(var i=0; i<3; i++)
{
    for(var j=0; j<4; j++)
    {
         new_array[j][i] = total_array[i][j];
    }
}

And after this for loop you have the new array containing the column-wise data in each row.

edited Feb 13, 2014 at 13:30

answered Feb 13, 2014 at 13:25

nitish712

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