Question

I need an 2d array [9,16] with 144 numbers from 1->36 in random order (so each number is repeated 4 times).

Answer 1

Something like:

sourcearr = array();
for(i = 0; i < 36; i++){
  for(j = 0; j < 4; j++){
      sourcearr[i+j] = i;
   }
}

sourcearr = shuffle(sourcearr)

k = 0;
myrandarr = array();
for(i = 0; i < 9; i++){
    myrandarr[i] = array();
    for(j = 0; j < 16; j++){
        myrandarr[i][j] = sourcearr[k++];
    }
}

where you use shuffle.