Permutations and Combinations (MT4)
Info
The Permutations and Combinations (MT4) is a Library for MetaTrader 4 that introductionoccasionally, there's a need to iterate over all combinations or permutations of a set of objects. Specifically, given a set of n objects, you may want to consider k of them at a time for each combination or permutation.
Usage
This tool is typically used for enhancing chart analysis and decision making.
Platform
This Library works exclusively on MetaTrader 4 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL4/Libraries folder via File ? Open Data Folder in MetaTrader 4.
How to Install and Use Permutations and Combinations (MT4)
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
IntroductionOccasionally, there's a need to iterate over all combinations or permutations of a set of objects.
Typical Use Case
This Library excels in automated trading and technical analysis on MetaTrader 4.
Compatible Platform & Setup
This Library works on MetaTrader 4. Place the file in the MQL4/Libraries folder and restart the terminal.
Description & Settings
Related: Time Management Utilities for MQL4/MQL5 - another powerful library for MetaTrader 4 traders.
IntroductionOccasionally, there's a need to iterate over all combinations or permutations of a set of objects. Specifically, given a set of n objects, you may want to consider k of them at a time for each combination or permutation.
Also recommended: math utils (mt4) - similar library with strong performance on MetaTrader 4.
Combinations and permutations algorithms can be used as a brute-force approach to solve certain problems by trying every possible combination or permutation until the optimal solution is found.
The circular k-permutations algorithm can be applied to real-world scenarios to address parts of the Traveling Salesman Problem (TSP) or similar problems like identifying currencies for triangular arbitrage in forex.
Solution
The following generic algorithms allow you to visit every combination or permutation of a sequence of length n, taken k items at a time.
Performance Considerations
This API library has been optimized for speed. Numerous algorithms and libraries for combinations/permutations were reviewed, and extensive benchmarks, code profiling, and micro-optimizations were conducted.
The Heap's algorithm in this library has been re-implemented for improved efficiency, offering faster performance than its standard implementation.
The included script 'currencyarbitrage_demo.mq4' scans all possible 28 currency pairs from the 8 major currencies in forex (USD, EUR, GBP, AUD, NZD, JPY, CAD, CHF). When an arbitrage opportunity meeting the profit threshold is identified, it's logged in the 'experts' log along with the potential profit rate. This script serves as a demonstration that can be integrated into an expert advisor/indicator to continuously monitor the market for arbitrage opportunities.
You may also like: Message Helper Functions for MT4/MT5 - excellent alternative for library users on MetaTrader 4.
Source Code
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⚠ 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.