Pine 脚本 - 尝试计算上市前低点的平均值

Question

我是 pine 脚本的新手并试图计算 plot 预售的平均低价不幸的是我的代码似乎无法正常工作，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)

这段代码导致了这个混乱：图

如果有人能指出我正确的方向，将不胜感激！

Answer 1

问题似乎是处理值何时为 na，或使用 barstate。 关于 na 值，脚本允许计算 na 值的可能性，您必须使用nz()来呈现值0或使用na()来测试条件并采取相应措施。 我不确定 barstate 是否会导致问题，但这不是必需的。

//@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)

小心 na 值很重要，因为您不知道脚本何时开始执行。 它可以在上市前的中间开始，这意味着当averageLow 为na 时，它使用averageLow 来计算averageLow。