2D Point Poisson Distribution

CharlesDesign

Hi all,

Within my 400*400 screen, I'm trying to uniformly distribute x number of points using Poisson distribution.

Can anyone help out, I'm struggling to translate the formula into code.

Thanks in advance, Charles

GoToLoop

http://StackOverflow.com/questions/1241555/algorithm-to-generate-poisson-and-binomial-random-numbers

/**
 * Poisson Distribution (v1.0)
 * mod GoToLoop (2016-Apr-17)
 *
 * forum.Processing.org/two/discussion/16058/
 * 2d-point-poisson-distribution
 *
 * StackOverflow.com/questions/1241555/
 * algorithm-to-generate-poisson-and-binomial-random-numbers
 */

void draw() {
  noLoop();
  println();

  for (float l = 1; l < 10; l += QUARTER_PI)
    println(l, TAB, poisson(l));

  background((color) random(#000000));
}

void mousePressed() {
  redraw();
}

void keyPressed() {
  redraw();
}

static final int poisson(final double lambda) {
  final double L = Math.exp(-lambda);

  double p = 1;
  int k = -1;

  do ++k; 
  while ((p *= Math.random()) > L);

  return k;
}

CharlesDesign

Thanks, however without comments I find it just as hard to understand. Would you mind clarifying what's going on, how would I get the x and y? Also, I'm not familiar with final and static.

Thanks again

GoToLoop

As I've linked above I've grabbed it from http://StackOverflow.com and adapted it to Processing.
I dunno what's behind the algorithm & never heard about it either! X_X
It only accepts a parameter called lambda. Maybe try out passing your coordinates as such? :-/

GoToLoop

Also, I'm not familiar with final and static.

You can remove both if you wish. It doesn't change anything after all. :P

1. https://Processing.org/reference/final.html
2. https://Processing.org/reference/static.html