"\nhttps://p5js.org/reference/#/p5/pixels";

​

let w = 200;

​

function setup() {

  createCanvas(w, w);

  print(info);

  background(0);

  loadPixels();

  for (let i = 0; i < 4 * w * w; i += 4 * (w + 1) ) pixels[i] = 255; // pixel 0,1,2 RED is in pixels[0,4,8]

  updatePixels();

}