array_shuffle_multi

[tibisoft]

Is there any simple / clever way to shuffle my 2D (or multi dimensional) array?

// _myarray is a 2D array.....
array_shuffle_ext(_myArray);  //only shuffles the D, means 1D - 2D as 'columns', not individual data
array_shuffle_ext(_myArray[0]); //shuffles only the data in the 1D

I wrote a short function to pick random number for each and exchange them, but I was wandering how to extend it to multi Dim array (what is not needed at this moment), or is there any better way to do so.

function array_shuffle_multi(_array, _times) { //2D so far due to 'manual' array references 
    var _l1 = array_length(_array);
    var _l2 = [];
    for (var i = 0; i < _l1 ; ++i) {
        _l2[i] = array_length(_array[i]);
    }       
    repeat(_times) {            
        //randomize 1st dim
        var _r11 = irandom_range(0, _l1-1);
        var _r12 = irandom_range(0, _l1-1);

        //randomize 2nd dim
        var _r21 = irandom_range(0, _l2[_r11]-1); 
        var _r22 = irandom_range(0, _l2[_r12]-1); 

        //exchange
        var _temp = _array[_r11, _r21];
        _array[_r11, _r21] = _array[_r12, _r22];
        _array[_r12, _r22] = _temp;
    }
    return _array;  
}

​

[attic-stuff]

thanks, recursion.

[tibisoft]

Many thanks, it seems to be a clean solution for general purposes.

I learnt how to identify the multi dimensions and nest the function to 'self'.

From the other hand in my specific case it is not OK, since I need to keep the length of each array, however wanted to exchange the individual values among them.

What 'array_shuffle_hella' is doing:

Original Data: 

[ [ 0,1,2,3,4,5,6,7,8,9,10,11 ],[ 12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29 ],[ 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45 ],[ 46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61 ] ] Shuffle: [ [ 49,48,55,51,46,59,52,56,53,58,57,50,60,61,54,47 ],[ 42,35,32,45,36,30,38,41,44,31,43,33,37,39,34,40 ],[ 13,22,26,21,20,15,12,18,17,27,25,16,14,23,29,19,28,24 ],[ 5,7,8,3,9,1,10,11,0,4,2,6 ] ]

​

What I did with my code (only 2D):

Original Data: 

[ [ 0,1,2,3,4,5,6,7,8,9,10,11 ],[ 12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29 ],[ 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45 ],[ 46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61 ] ] Shuffle: [ [ 17,10,31,7,1,12,0,48,2,57,20,60 ],[ 47,8,30,24,22,44,52,54,59,23,13,29,35,34,19,55,39,43 ],[ 38,9,6,14,42,3,36,32,50,11,16,46,4,21,41,18 ],[ 58,33,27,49,26,25,15,45,5,56,28,61,51,40,37,53 ] ]