Pine 脚本条件 1 和条件 2 在最多 n 步后满足

Question

假设我有条件 1 和条件 2。如果条件 1 和条件 2 在最多 5 个柱内得到满足，那么我想执行一些操作。例如，假设条件 1 在当前收盘时满足，条件 2 在 5 个柱前满足，那么我想执行一些操作。我如何在 Pine 中制定它？

condition1 = ...
condition2 = ...

if (condition1(close)==true or condition1(close-2)==true  or             
condition1(close-3)==true  or condition1(close-4)==true  or     
condition1(close-5)==true)

and (condition2(close)==true or condition2(close-2)==true  or             
condition2(close-3)==true  or condition2(close-4)==true  or     
condition2(close-5)==true)

then...

是否可以这样表述：

if condition1(close:close-5)== true and condition2(close:close-5)== true then ...

我读过例如这个线程： Change background for only the last 5 bars: A Very Simple Problem I can't crack 这听起来像一个类似的问题，但我不确定如何实现它。

Answer 1

a) 您需要使用ta.barssince() 函数。

https://www.tradingview.com/pine-script-reference/v5/#fun_ta%7Bdot%7Dbarssince

//@version=5
indicator("My Script")

/// let's say condition 1 was met at current close, and condition 2 was fulfilled 5 bars ago, then I want to perform some action

ema10 = ta.ema(close, 10)
condition1 = close > open
condition2 = ta.crossover(ema10, close)


x = false

if condition1 and ta.barssince(condition2) == 5
    x := true


plot(ema10)    
bgcolor(condition2? color.orange:na)
bgcolor(x?color.green:na)

b) 另一种方法是使用历史引用运算符[]。

https://www.tradingview.com/pine-script-docs/en/v5/language/Operators.html#history-referencing-operator

//@version=5
indicator("My Script")

// lets say you want to check if condition2 if true for 5 bars, and condition1 is true in the current bar

ema10 = ta.ema(close, 10)
condition1 = ta.crossover(ema10, close) 
condition2 = close > open

condition3 = condition2[1] and condition2[2] and condition2[3] and condition2[4] and condition2[5]


x = false

if condition1 and condition3
    x := true

plot(ema10)    
bgcolor(condition2? color.orange:na)
bgcolor(x?color.green:na)