Скачать или смотреть How to Use Pine Script Loops on Bar Index for Custom Conditions

Learn how to implement loops in Pine Script to check conditions over multiple bars with a user-defined length. Dive into examples and understand the syntax of Pine script for better trading indicators!
---
This video is based on the question https://stackoverflow.com/q/65973078/ asked by the user 'Ariza' ( https://stackoverflow.com/u/10860007/ ) and on the answer https://stackoverflow.com/a/65977519/ provided by the user 'AnyDozer' ( https://stackoverflow.com/u/14860394/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Pine script loop on bar index

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding Pine Script Loops on Bar Index

Working with Pine Script can sometimes feel challenging, especially when you want to perform complex operations involving conditions and bar indices. Suppose you're trying to evaluate a specific condition across the last n bars to build a reliable trading indicator. This blog will help you understand how to implement loops in Pine Script to check conditions over multiple bars with a user-defined length.

The Problem Explained

Imagine you want to check if the closing price (close) is greater than the opening price (open) for the past n bars. To do this using Pine Script, you could manually reference each condition like this:

[[See Video to Reveal this Text or Code Snippet]]

While this works for a fixed number of bars, it’s inefficient and hard to manage if you want to check for different lengths dynamically. That’s where a loop function can simplify your work!

The Solution

To dynamically check conditions over a set number of bars, you can use a function that incorporates a loop. This solution utilizes a for loop that iterates through your specific number of bars and evaluates the condition for each index.

Step-by-Step Implementation

Define the Function:
You’ll create a function to check if a specified condition is true over a defined number of bars.

[[See Video to Reveal this Text or Code Snippet]]

Set the Condition:
You define the condition you want to evaluate over the bars. For this example, it will be whether the closing price is greater than the opening price.

[[See Video to Reveal this Text or Code Snippet]]

Use the Function:
Finally, you can call the function with your condition and the number of bars you want to check.

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example

Here’s how this looks when put together:

[[See Video to Reveal this Text or Code Snippet]]

Key Notes

_length Adjustment: When setting up your loop, it’s crucial that the upper limit is _length - 1 to avoid referencing bars that don’t exist.

Dynamic Evaluation: This script allows you to dynamically check conditions for any number of past bars simply by changing the argument you pass to the check function, such as check(cond, 5) for the last five bars.

Conclusion

By using loops in Pine Script, you simplify the process of checking conditions over multiple bars, leading to cleaner code and enhanced flexibility for your trading strategies. Now, you can dynamically assess conditions over various time frames without cluttering your code with repetitive conditions.

Try implementing this approach in your trading scripts to enhance your trading tools and improve your analysis efficiency!