生成一个随机平稳趋势（随机游走）在JavaScript [英] Generating a Smooth Random Trend (Random Walk) in JavaScript
问题描述
我要寻找一个随机游走/随机潮流算法的JavaScript实现。我需要的东西，将与趋势（所以，只是简单的随机变化量是出）坚持，同时还保持了一些规定范围内。 我试着写一些东西从我的头顶通过选择基于加权平均数字（使用高斯函数的重量计算），并结束了一个稍微平滑的线（不够好）。然后，我花了一个不那么直接的方式，并试图在互联网上搜索，尽管我发现了几个轮廓，没有什么具体的不多，所以我的理解。
I am looking for a JavaScript implementation of a random walk/random trend algorithm. I need something that will stick with a trend (so, just plain random deltas are out) while still staying within some specified boundaries. I tried writing something off the top of my head by choosing numbers based on a weighted average (the weight was calculated using the Gaussian function) and ended up with a slightly smoother line (not good enough). I then took a less direct approach and tried searching on the internet, and although I found a few outlines, there was nothing specific enough that I understood.
事实证明（我不知道这本来），似乎已经有一个家庭使用高斯公式进行随机潮流算法。但是，尽管搜索的时间，我找不到比抽象的方程式是没有用的，我更多。我能找到的是这个博客<最好的/ A>，在那里他显示随机的数据，如我在寻找的照片。他列出公式，但我不知道这些其实都应该是说（对我来说，它似乎并不像它甚至有一个完整的解决方案）。
As it turns out (I was not aware of this originally), it seems there is already a family of algorithms that use the Gaussian equation to make a random trend. But, despite hours of searching, I couldn't find much more than abstract equations that were no use to me. The best that I could find was this blog where he shows a picture of random data like I'm looking for. He lists equations, but I have no idea what those actually are supposed to mean (to me, it doesn't seem like it's even a full solution).
什么算法都已经在那里（的JavaScript或C类实现preferably）来产生这样的数据？
What algorithms are already out there (JavaScript or C-like implementations preferably) to generate data like this?
推荐答案
下面是我想出了从阅读您链接的博客。据我所知，这是作者做了他的第一个图形。
Here is what I came up with from reading the blog that you linked. As far as I can tell, this is what the author did for his first graph.
CSS
#container {
min-width: 310px;
height: 400px;
margin: 0 auto;
}
HTML
HTML
<div id="container"></div>
Javascript的
Javascript
var boxMullerRandom = (function () {
var phase = 0,
RAND_MAX,
array,
random,
x1, x2, w, z;
if (crypto && typeof crypto.getRandomValues === 'function') {
RAND_MAX = Math.pow(2, 32) - 1;
array = new Uint32Array(1);
random = function () {
crypto.getRandomValues(array);
return array[0] / RAND_MAX;
};
} else {
random = Math.random;
}
return function () {
if (!phase) {
do {
x1 = 2.0 * random() - 1.0;
x2 = 2.0 * random() - 1.0;
w = x1 * x1 + x2 * x2;
} while (w >= 1.0);
w = Math.sqrt((-2.0 * Math.log(w)) / w);
z = x1 * w;
} else {
z = x2 * w;
}
phase ^= 1;
return z;
}
}());
随机游走 发电机
function randomWalk(steps, randFunc) {
steps = steps >>> 0 || 100;
if (typeof randFunc !== 'function') {
randFunc = boxMullerRandom;
}
var points = [],
value = 0,
t;
for (t = 0; t < steps; t += 1) {
value += randFunc();
points.push([t, value]);
}
return points;
}
辅助函数从随机游走点得到Y值
function getYValues(points) {
return points.map(function (point) {
return point[1];
});
}
辅助功能，产生X地块为图
function generatePlots(howMany) {
howMany = howMany >>> 0 || 10;
var plots = [],
index;
for (index = 0; index < howMany; index += 1) {
plots.push({
name: 'plot' + index,
data: getYValues(randomWalk())
});
}
return plots;
}
图的结果，使用 的jQuery 并 highcharts.js
$('#container').highcharts({
title: {
text: 'Random Walk',
x: -20 //center
},
subtitle: {
text: 'Random Walk',
x: -20
},
xAxis: {
type: 'linear'
},
yAxis: {
title: {
text: 'Value'
},
plotLines: [{
value: 0,
width: 1,
color: '#808080'
}]
},
tooltip: {
valueSuffix: ' units'
},
legend: {
layout: 'vertical',
align: 'right',
verticalAlign: 'middle',
borderWidth: 0
},
series: generatePlots(10)
});
这篇关于生成一个随机平稳趋势（随机游走）在JavaScript的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
