加权随机数选择 [英] Weighted Random number selection
问题描述
我正在开发一个 node.js 应用程序,其中必须根据 [0, 100] % 范围内的获胜概率随机选择获胜者
我的代码如下:
var activeGame = {编号:12324,类型:1,活跃:真实,球员:[{编号:5032,name: "用户名",富:对,获胜概率:56.32//%}, {编号:98243,name: "用户名",富:对,获胜概率:22.68//%}, {编号:10943,name: "用户名",富:假,获胜概率:21.00//%}],};
我发现其他算法不是很清楚,并且在概率加起来达到 100% 时不起作用.
我正在寻找一种方法来创建一个 function selectRandomWinner()
以返回获胜玩家的索引,但我被卡住了,所有帮助都会不胜感激.谢谢!
计算一个从 0 到 100 的随机数.然后循环玩家将他们的概率加到总数中,直到总数大于随机数:>
var activeGame = {编号:12324,类型:1,活跃:真实,球员:[{编号:5032,姓名:乔",富:对,获胜概率:56.32//%}, {编号:98243,姓名:简",富:真的,获胜概率:22.68//%}, {编号:10943,姓名:弗雷德",富:假,获胜概率:21.00//%}],};功能pickPlayer(){var randPct = Math.random() * 100;无功总计 = 0;var 玩家 = activeGame.players;var selectedPlayer;for (var i = 0; i
挑选1000名玩家的结果:<table id="结果"><tr><th>姓名</th><th>Count</th></table>
I'm developing a node.js app where a winner has to be randomly selected based on it's win probability in the range of [0, 100] %
My code is as follows:
var activeGame = {
id: 12324,
type: 1,
active: true,
players: [{
id: 5032,
name: "Username",
foo: true,
winProbability: 56.32 //%
}, {
id: 98243,
name: "Username",
foo: true,
winProbability: 22.68 //%
}, {
id: 10943,
name: "Username",
foo: false,
winProbability: 21.00 //%
}],
};
I've found other algorithms that weren't very clear and didn't work with probabilities adding up to 100%.
I'm looking for a way to create a function selectRandomWinner()
to return the index of the winning player but I'm stuck and all and any help would be greatly appreciated. Thanks!
Calculate a random number from 0 to 100. Then loop through the players adding their probability to a total, until the total is higher than the random number:
var activeGame = {
id: 12324,
type: 1,
active: true,
players: [{
id: 5032,
name: "Joe",
foo: true,
winProbability: 56.32 //%
}, {
id: 98243,
name: "Jane",
foo: true,
winProbability: 22.68 //%
}, {
id: 10943,
name: "Fred",
foo: false,
winProbability: 21.00 //%
}],
};
function pickPlayer() {
var randPct = Math.random() * 100;
var total = 0;
var players = activeGame.players;
var selectedPlayer;
for (var i = 0; i < players.length; i++) {
total += players[i].winProbability;
if (randPct < total) {
selectedPlayer = players[i];
break;
}
}
return selectedPlayer;
}
var results = document.getElementById("results");
var resultObj = {};
for (var i = 0; i < 1000; i++) {
var playerName = pickPlayer().name;
if (resultObj[playerName]) {
resultObj[playerName] ++;
} else {
resultObj[playerName] = 1;
}
}
for (name in resultObj) {
results.innerHTML += "<tr><td>" + name + "</td><td>" + resultObj[name] + "</td></tr>";
}
Results of picking 1000 players:
<table id="results">
<tr>
<th>Name</th>
<th>Count</th>
</table>
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