I have a question about the transpose of a 2D Array or Matrix. I wrote a short programm to explain my problem:

int [][] matrix = { {0, 0, 0}, 
                    {0, 1, 0}, 
                    {1, 1, 1} };

int [][] tmpMatrix = new int [3][3];
int [][] newMatrix = new int [3][3];

void setup() {
  size(800, 600);
  background(0);
  tmpMatrix = matrix;
}

void draw() {
  drawMatrix(newMatrix);
  for (int j = 0; j<3; j++) {
    for (int i = 0; i<3; i++) {

      **newMatrix[j][i]**=tmpMatrix[i][j];
    }

    print("\n");
  }
  drawMatrix(matrix);
  drawMatrix(tmpMatrix);
  drawMatrix(newMatrix);
  noLoop();
}

void drawMatrix(int [][] matrix) { 
  for (int j = 0; j<3; j++) {
    print("\n");
    for (int i = 0; i<3; i++) {
      print(matrix[j][i]);
    }
  }
  print("\n");
}

So this programm works fine and I get the transpose of the Matrix in "newMatrix".

But when I change the variable from "newMatrix" into "matrix" (I mean inside of the two for loops) the transposed matrix is wrong !

I don't understand what is the problem here.

Thank you a lot !