int col = 10;
int row = 10;
int state = 0;
int [][] thisgen = new int [row][col];

void setup() {
  size(400, 400);
  for (int i = 0; i < thisgen.length; i++) {
    for (int j = 0; j < thisgen.length; j++) {
      fill(200);
      rect(i*width/col, j*height/row, width/col, height/row);
    }
  }
}