从系列中获取恒定值 [英] Getting a constant value from a series

问题描述

我想为变量分配一个常量值.这个值来自一个系列.该值是 10 根柱线，除非有新柱线，否则必须保持不变.

我尝试了这段代码并对其进行了许多变体，但没有奏效.

//@version=4研究(标题=X"，覆盖=假)无功x = 0.0x := valuewhen(barstate.islast, sum(cht_acum[10], 10), 1)情节(x，标题=X")

我没有得到一条直线，或者我得到了 NA.如何解决问题?

解决方案

Version 1

很难弄清楚你想要什么.这可能会接近.您可以使用输入仅在最后一个条形图上绘制:

//@version=4研究(标题 = X"，叠加 = 假)cht_acum = 关闭plotOnLastBarOnly = 输入(假)x = sum(cht_acum[10], 10)情节(barstate.islast 或不 plotOnLastBarOnly ?x:na，标题 = X")

版本 2

此版本使用了

I want to assign a constant value to a variable. This value comes from a series. The value is 10 bars back, and must stay constant unless there is a new bar.

I tried this code and lots of variations on it, but it didn't work.

//@version=4
study(title = "X", overlay = false)

var x = 0.0
x := valuewhen(barstate.islast, sum(cht_acum[10], 10), 1)

plot(x, title = "X")

I don't get a straight line, or I get NA. How to resolve the issue?

解决方案

Version 1

Hard to figure out what you want. This may come close. You can use the Inputs to plot only on the last bar:

//@version=4
study(title = "X", overlay = false)
cht_acum = close
plotOnLastBarOnly = input(false)
x = sum(cht_acum[10], 10)
plot(barstate.islast or not plotOnLastBarOnly ? x : na, title = "X")

Version 2

This version uses the brilliant Sum() function from alexgrover found in Functions Allowing Series As Length - PineCoders FAQ, which accepts a series length. Should be closer to your needs:

//@version=4
study("")
Sum(src,p) => a = cum(src), a - a[max(p,0)]
cond = rising(close, 30)
sourceSeries = 1.
var count = 0.
if cond
    count := 1.
else
    count := min(10, count + 1)
total = Sum(sourceSeries, count)
plot(total)
plotchar(cond, "cond", "•", location.top, size = size.tiny)

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