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                # Kotlin 程序:計算標準差 > 原文: [https://www.programiz.com/kotlin-programming/examples/standard-deviation](https://www.programiz.com/kotlin-programming/examples/standard-deviation) #### 在此程序中,您將學習使用 Kotlin 中的函數來計算標準差。 該程序使用數組計算單個系列的標準差。 訪問此頁面以了解[標準差](http://www.mathsisfun.com/data/standard-deviation.html "Standard Deviation")。 為了計算標準差,創建了`calculateSD()`函數。 包含 10 個元素的數組將傳遞給該函數,此函數將計算標準差并將其返回給`main()`函數。 ## 示例:計算標準差的程序 ```kt fun main(args: Array<String>) { val numArray = doubleArrayOf(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0) val SD = calculateSD(numArray) System.out.format("Standard Deviation = %.6f", SD) } fun calculateSD(numArray: DoubleArray): Double { var sum = 0.0 var standardDeviation = 0.0 for (num in numArray) { sum += num } val mean = sum / 10 for (num in numArray) { standardDeviation += Math.pow(num - mean, 2.0) } return Math.sqrt(standardDeviation / 10) } ``` 運行該程序時,輸出為: ```kt Standard Deviation = 2.872281 ``` 在上面的程序中,我們使用了`Math.pow()`和`Math.sqrt()`的幫助來分別計算冪和平方根。 以下是等效的 Java 代碼:[用于計算標準差的 Java 程序](/java-programming/examples/standard-deviation "Java program to calculate standard deviation")。
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