Standard Deviation Calculation for Indicator Buffers
Info
The Standard Deviation Calculation for Indicator Buffers is a Library for MetaTrader 5 that the cstddevonarray class facilitates the calculation of standard deviation on indicator buffers. Initialization:The Init() method is called within the initialization function with the following parameters:int aperiod - The indicator period.
Usage
This tool is typically used for enhancing chart analysis and decision making.
Platform
This Library works exclusively on MetaTrader 5 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL5/Libraries folder via File ? Open Data Folder in MetaTrader 5.
How to Install and Use Standard Deviation Calculation for Indicator Buffers
1. Storage: Place library files in the MQL/Libraries directory to ensure they are accessible to your projects.
2. Implementation: Include the library in your code using the #import directive, ensuring you match the exact function names and parameters.
3. Compilation: Ensure the library is present in the directory before you compile your main EA or script, as the compiler links them during this phase.
4. Management: Keep libraries organized in sub-folders if you manage many custom functions to maintain a clean project structure.
Frequently Asked Questions
Q: What is a library file used for? A: Libraries store reusable code modules, allowing you to centralize common logic used by multiple EAs or indicators.
Q: Is a library executable? A: No, libraries are non-executable files containing functions; they must be imported into an EA, indicator, or script to function.
Q: Can I update a library while the platform is running? A: You should compile your EA or script after updating a library to ensure the latest code changes are integrated.
What this tool does
The CStdDevOnArray class facilitates the calculation of standard deviation on indicator buffers.
Typical Use Case
This Library excels in automated trading and technical analysis on MetaTrader 5.
Compatible Platform & Setup
This Library works on MetaTrader 5. Place the file in the MQL5/Libraries folder and restart the terminal.
Description & Settings
Related: crect and ccanvas replacement (standard library - several bugs fixed) - another powerful library for MetaTrader 5 traders.
The CStdDevOnArray class facilitates the calculation of standard deviation on indicator buffers.Also recommended: Trading Signals Module Based on WPR S iSignal Indicator - similar library with strong performance on MetaTrader 5.
Initialization:
The Init() method is called within the initialization function with the following parameters:
int aperiod - The indicator period.
ENUM_MA_METHOD amethod - The Moving Average method.
Calculation:
The Solve() method is called within the calculation function with the following parameters:
const int arates_total - The rates_total variable from the OnCalculate() function parameters.
const int aprev_calculated - The prev_calculated variable from the OnCalculate() function.
double & adata[] - The close data buffer for the indicator calculation.
double & ama[] - An intermediate buffer for the average value calculation.
double & astddev[] - The buffer storing the calculated indicator values.
A sample indicator, Test_StdDevOnArray.mq5, demonstrates the application of the CStdDevOnArray class. The StdDevOnArray.mq5 file should be placed in the MQL5\Include\IncOnArray directory within your terminal's data folder. The IncOnArray folder must be created if it does not exist.
The CMAOnArray class from the CMAOnArray.mq5 file is required for this class to function correctly.
Standard deviation is a measure of market volatility, indicating the range of price fluctuations relative to the average price.
This indicator was developed in 2026.
You may also like: MQTT Five — MQTT 5.0 Client Library for MetaTrader 5 - excellent alternative for library users on MetaTrader 5.
Source Code
#property copyright "robotfx"
#property link "https://robotfx.org"
#property version "1.00"
#property indicator_separate_window
#property indicator_buffers 3
#property indicator_plots 1
#property indicator_label1 "label1"
#property indicator_type1 draw_line
#property indicator_color1 clrred
#property indicator_style1 style_solid.......
⚠ Limitations & Risk Warning
- This tool is provided for educational and testing purposes only.
- Past performance does not guarantee future results.
- Trading involves substantial risk of loss. Use on a demo account first.
- Results may vary depending on market conditions, broker, and settings.
- We recommend thorough backtesting and forward testing before using with real funds.