我只是迷路了，似乎不知道該怎么計(jì)算簡(jiǎn)單的移動(dòng)平均線？這是文件中用于計(jì)算簡(jiǎn)單移動(dòng)平均線的方法之一。 public async Task<decimal?> UpdateAsync(decimal? value, CancellationToken cancelToken) { await Task.Run(() => { var av = default(decimal?); if (_av.Count - 1 >= _p) { } else { av = value; } _av.Add(av); return av; }, cancelToken).ConfigureAwait(false); throw new Exception("major issue"); } }
2 回答
慕勒3428872
TA貢獻(xiàn)1848條經(jīng)驗(yàn) 獲得超6個(gè)贊
讓我們從問(wèn)題開(kāi)始：
我只是迷路了，似乎不知道該怎么計(jì)算簡(jiǎn)單的移動(dòng)平均線？
鑒于
public static class Extensions
{
public static IEnumerable<decimal> MovingAvg(this IEnumerable<decimal> source, int period)
{
var buffer = new Queue<decimal>();
foreach (var value in source)
{
buffer.Enqueue(value);
// sume the buffer for the average at any given time
yield return buffer.Sum() / buffer.Count;
// Dequeue when needed
if (buffer.Count == period)
buffer.Dequeue();
}
}
}
用法
static void Main(string[] args)
{
var input = new decimal[] { 1, 2, 2, 4, 5, 6, 6, 6, 9, 10, 11, 12, 13, 14, 15 };
var result = input.MovingAvg(2);
Console.WriteLine(string.Join(", ",result));
}
輸出
1, 1.5, 2, 3, 4.5, 5.5, 6, 6, 7.5, 9.5, 10.5, 11.5, 12.5, 13.5, 14.5
慕慕森
TA貢獻(xiàn)1856條經(jīng)驗(yàn) 獲得超17個(gè)贊
所以首先什么是移動(dòng)平均線
簡(jiǎn)單移動(dòng)平均線是一種計(jì)算數(shù)字流平均值的方法，它僅對(duì)流中的最后一個(gè) P 數(shù)字求平均值，其中 P 稱為周期。
接下來(lái)是代碼，就像我想象我的移動(dòng)平均線是如何實(shí)現(xiàn)的?？梢允褂茫窃谖覀兲砑訑?shù)字后的每一步，我都希望我的平均值得到更新。LINQ
我的代碼被大量注釋，所以請(qǐng)閱讀注釋。
public class MovingAverageCalculator {
/// <summary>
/// Maximum number of numbers this moving average calculator can hold.
/// </summary>
private readonly int maxElementCount;
/// <summary>
/// Numbers which will be used for calculating moving average.
/// </summary>
private readonly int[] currentElements;
/// <summary>
/// At which index the next number will be added.
/// </summary>
private int currentIndex;
/// <summary>
/// How many elements are there currently in this moving average calculator.
/// </summary>
private int currentElementCount;
/// <summary>
/// Current total of all the numbers that are being managed by this moving average calculator
/// </summary>
private double currentTotal;
/// <summary>
/// Current Average of all the numbers.
/// </summary>
private double currentAvg;
/// <summary>
/// An object which can calcauclate moving average of given numbers.
/// </summary>
/// <param name="period">Maximum number elements</param>
public MovingAverageCalculator(int period) {
maxElementCount = period;
currentElements = new int[maxElementCount];
currentIndex = 0;
currentTotal = 0;
currentAvg = 0;
}
/// <summary>
/// Adds an item to the moving average series then updates the average.
/// </summary>
/// <param name="number">Number to add.</param>
public void AddElement(int number){
// You can only have at most maximum elements in your moving average series.
currentElementCount = Math.Min(++currentElementCount, maxElementCount);
// IF your current index reached the maximum allowable number then you must reset
if (currentIndex == maxElementCount){
currentIndex = 0;
}
// Copy the current index number to the local variable
var temp = currentElements[currentIndex];
// Substract the value from the current total because it will be replaced by the added number.
currentTotal -= temp;
// Add the number to the current index
currentElements[currentIndex] = number;
// Increase the total by the added number.
currentTotal += number;
// Increase index
currentIndex++;
// Calculate average
currentAvg = (double)currentTotal / currentElementCount;
}
/// <summary>
/// Gets the current average
/// </summary>
/// <returns>Average</returns>
public double GetAverage() => currentAvg;
}
最后，我檢查了你的代碼，但它對(duì)我來(lái)說(shuō)沒(méi)有意義
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