在Xcode 7.3.1游乐场中正确绘制数组

Question

我试图检查Xcode中各种随机化函数的分布是什么样子，所以我做了这个实验：

import UIKit
import XCPlayground

var distribution: [Int] = Array(count: 6, repeatedValue: 0)
for i in 1...100000 {
    let randomNumber = arc4random_uniform(6)
    distribution[Int(randomNumber)] += 1
    XCPlaygroundPage.currentPage.captureValue(distribution[Int(randomNumber)], withIdentifier: "Random Distribution")
}

我怎么才能让它保持水平呢？

Answer 1

您在收集值时捕获了这些值，您想要的是最终值：

for i in 0..<6 {
   XCPlaygroundPage.currentPage.captureValue(distribution[i], withIdentifier: "Distribution")
}

Answer 2

好的，我摆弄了一下，这个效果很好。

var distribution: [Int] = Array(count: 6, repeatedValue: 0)
let distributionSource = GKARC4RandomSource()
distributionSource.dropValuesWithCount(1024)
for i in 1...10000 {
    let randomNumber = distributionSource.nextIntWithUpperBound(6)
    distribution[Int(randomNumber)] += 1
}
for value in distribution  {
XCPlaygroundPage.currentPage.captureValue(value, withIdentifier: "Random Distribution")
}

现在我可以更改数字并查看我的曲线:-)