tripzilch

Some quick notes about PRNGs

If the docs don't specify the cycle length, IMHO better not use it in situations where it matters.

65**5 is about 30 bits. if the PRNG-state is 32 bits, and the PRNG algorithm doesn't cycle through the full state, that may already be too little.

In many languages the default PRNG is implemented as a LCG, which are just 2-3 lines of code, and just not very good on their own. Computational science has found much, much better algorithms that are (almost) just as tiny to implement. Maybe 4-5 lines, see PCG-random.org.

I recently used a Java port of CMWC4096 from StackOverflow, for a numerical simulation in Java (where the default Math.random() has a stupid-bad cycle length, and the Java crypto-PRNG might have been too slow). It worked great. Not quite as tiny as PCG-random, but still short and it was ready-to-use Java-code that fit my needs.

tripzilch

Mogelijk de beste chili ooit (vegetarisch)

• 2-3 medium uien, halve ringen
• 3 dikke tenen knoflook, gesnipperd
• 1 zoete aardappel (paarse schil), blokjes
• 1 chilipeper, pitjes verwijderd, fijngesnipperd (2 was achteraf beter denk ik)
• halve winterpeen, kleine blokjes / gesnipperd
• genoeg olijfolie

in stevige grote pan aanbakken/fruiten tot het bruin begint te worden. ondertusen oven voorverwarmen. daarna toevoegen:

tripzilch

Pasta en champignon en crème fraiche en broccoli

Voor 2 personen.

• 1 bakje champignons
• 1 broccoli (of 2 kleintjes)
• 2-3 uien, 3-4 dikke tenen knoflook
• 1 bekertje creme fraiche
• zonnebloempitjes (optioneel)
• verse zwarte peper

tripzilch

// RNG = Math.random
RNG = xorshift128

function nonsense() {
  // if all you need 
  // is a random seed
  // of type string 
  // then this thing
  // does the deed, hey 
  xorshift128_seed(Date.now() + '');

tripzilch

const CAPACITY = 8;

class QuadTree {
  constructor(x, y, w, h) {
    // the rect (x,y,w,h) defines the product of two half-open intervals: [x, x+w) × [y, y+h)
    this.x = x; this.xe = x + w;  
    this.y = y; this.ye = y + h;
    this.w = w;
    this.h = h;
    this.pts = [];

tripzilch

001

Love the way the light shines through it like that

002

The General Prototype

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