回顾第一个绿色酒吧

Question

我正在使用一些代码（对 Pine 来说非常新），我在其中连续查找 3 根绿色蜡烛并为第一根蜡烛添加标签。使用 bar_index-2，这部分很容易。 但是，假设连续有 5 支绿色蜡烛。我有多个标签，但我只希望标签位于第一个绿色蜡烛上，该蜡烛连续 5 个开始。我如何获得这些信息？ 感谢您的帮助！ 抢

Answer 1

这需要一个向下栏来重置条件：

//@version=4
study("", "", true)

// Define our boolean condition for an up bar.
upBar = close > open

// Here we do many things in one line:
// 1. Using `sum()`, we will add a value for the last 3 bars.
//    That's the `sum(..., 3)` part.
// 2. The value we add for each bar is the evaluation of an expression.
//    That expression is a ternary: `upBar ? 1 : 0`.
//    It evaluates to `1` if the current bar is an upBar,
//    and to zero when it is not.
// 3. We use the `==` boolean operator to compare the result of `sum()` to `3`.
//    When it is equal to `3`, `true` will be assigned to `upBars3`.
//    This will occur when `upBar` was true on each of the last 3 bars.
upBars3 = sum(upBar ? 1 : 0, 3) == 3

// Here we generate a signal when our `upBars3` boolean variable is `true`,
// and it was not `true` on the previous bar, which is the `not upBars3[1]` part.
signal = upBars3 and not upBars3[1]

// Here we plot an arrow 2 bars back when our signal triggers.
// Note that if you publish a script plotting in the past like this,
// it is expected that you will explain this in your script's description
// so you do not mislead traders into thinking your script is prescient.
plotchar(signal, "signal", "▲", location.top, size = size.tiny, offset = - 2)