Pine脚本-尝试计算售前低点的平均值

Question

我是pine脚本的新手，试图计算和绘制售前的平均低价不幸的是，我的代码似乎不能正常工作，我找不到原因

var preMarketSession = "0400-0930" //setting the premarket time
isPreMarket = not na(time(timeframe.period, "0400-0930")) //boolean for if the session is currently in premarket

var int barsInPreMarket = 0
var float averageLow = na


// Confirming first bar of premarket
if isPreMarket and not isPreMarket[1]
    averageLow := 0


//Counting the number of bars in premarket
if (isPreMarket and barstate.isnew)
    barsInPreMarket := barsInPreMarket + 1


//Calculating the avg of low prices on end of bar
if isPreMarket and barstate.isconfirmed
    for i=0 to barsInPreMarket - 1
        averageLow := (averageLow + low) / barsInPreMarket

// Resseting the car count and avarage upon exiting premarket
if not isPreMarket
    barsInPreMarket := 0
    averageLow := na


plot(averageLow)

这段代码会导致这样的混乱：Graph

如果有人能为我指明正确的方向，我将不胜感激！

Answer 1

问题似乎要么是当值为na时的处理，要么是使用barstate。关于NA值，脚本允许对NA值进行计算，您必须使用nz()来呈现值0，或者使用na()来测试条件并执行相应的操作。我不确定是不是barstate导致了这些问题，但它不应该是必要的。

//@version=4
study("My Script",overlay=true)
var preMarketSession = "0400-0930" //setting the premarket time
isPreMarket = not na(time(timeframe.period, "0400-0930")) //boolean for if the session is currently in premarket

var int barsInPreMarket = 0
var float lowSum = na
var float averageLow = na


if isPreMarket
    if na(lowSum)
        barsInPreMarket := 1
        lowSum := low
        averageLow := low
    else
        barsInPreMarket := barsInPreMarket + 1
        lowSum := lowSum + low
        averageLow := lowSum / barsInPreMarket
else if isPreMarket[1]
    lowSum := na
    barsInPreMarket := 0

plot(averageLow)

注意na值很重要，因为您不知道脚本何时开始执行。它可以从上市前的中期开始，这意味着当averageLow为na时，它将使用averageLow来计算averageLow。