Hello,
I get a "NullPointerException" running the following code:

int[][] MyArray = new int[5][8];

void setup() {
  size(100, 100);
  noLoop();
}
void draw() {
  MyArray = (int[][]) expand(MyArray);
  MyArray[0] = (int[]) expand(MyArray[0]);
  println(MyArray.length);                          // 10  -> expected
  println(MyArray[0].length);                      // 16  -> expected
  MyArray [2][5] = 34;
  println(MyArray[0] [5]);                           //   0  -> ??
  MyArray [8] [10] =41;                            // Null Pointer Exception
}
It seems to me I have to instanciate the expanded array. But how to do (without loosing the data of the original array)? 
Thanks in advance for any kind of help!
Carlos