int cols = 10;
int rows = 10;
int rectSize;

void setup() {
  size(400, 400);
  rectSize = width / cols;
  noLoop(); // We don't need to continuously redraw the pattern
}

void draw() {
  background(255);
  
  for (int i = 0; i < cols; i++) {
    for (int j = 0; j < rows; j++) {
      int x = i * rectSize;
      int y = j * rectSize;
      float redColor = map(i, 0, cols-1, 0, 255); // Modify red based on column index
      float greenColor = map(j, 0, rows-1, 0, 255); // Modify green based on row index
      fill(redColor, greenColor, 150); // Vary color based on position
      rect(x, y, rectSize, rectSize);
    }
  }
  save("activity13.png");
}