[0,1] functions

_.md

[ Launch: [0,1] functions ] 6199296 by enjalot

config.json

{"description":"[0,1] functions","endpoint":"","display":"svg","public":true,"require":[],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01,"thumbnail":"http://i.imgur.com/LxD0Hf6.png"}

inlet.js

var svg = d3.select("svg");

var w = 400;
var h = 367;

var n = 100;
var f = pdf(0, 0.23);
//f = d3.ease("bounce")
//f = d3.ease("cubic");
//f = d3.ease("quad");
//f = d3.ease("back")
//f = d3.ease("circle")
//f = d3.ease("sin")
//f = d3.ease("poly",4)



var line = d3.svg.line()
.x(function(d) { return d.x })
.y(function(d) { return d.y })

var yscale = d3.scale.linear()
.domain([0, 1])
.range([h/2, 0])


function pdf(Mean, StdDev) {
  return function(x) {
    var a = x - Mean - 0.5;
    return Math.exp(-(a * a) / (2 * StdDev * StdDev)) / (Math.sqrt(2 * Math.PI) * StdDev); 
  }
}

function cdf(x)
{
	if(x === 0)	// no approximation necessary for 0
		return 0.50;
		
	var t1,t2,t3,t4,t5,qx;
	var negative = false;
	if(x < 0)
	{
		x = -x;
		negative = true;
	}
	t1 = 1 / (1 + (0.2316419 * x)); 
	t2 = t1 * t1; 
	t3 = t2 * t1; 
	t4 = t3 * t1; 
	t5 = t4 * t1;
	qx = pdf(0,1)(x) * ((0.319381530 * t1) + (-0.356563782 * t2) + 
								(1.781477937 * t3) + (-1.821255978 * t4) + (1.330274429 * t5));
	if(negative == true)
		qx = 1 - qx;
	return qx;
}
//-------------


var data = d3.range(n).map(function(i) {
  var x = i/n;
  return {
    x: w/2 + w * x,
    y: h + yscale(f(x))
  }
})

//console.log(data)
svg.append("path")
.datum(data)
.attr("d", line)
.style({
  fill: "none",
  stroke: "#5283DB",
  "stroke-width":4
})

var target = 50;
var random = [];

var num = 402
var count = 0;
var diff = 0;
var dt = target/num;
d3.range(num).forEach(function(i) {
  //random.push(cdf(i/num))
  count += dt;
  diff += dt;
  if(Math.floor(diff)) {
     random.push(i)
     diff = 0;
   }
  count += cdf(i/num)
})
console.log(random)
console.log(random.length)