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expression solver for mt5
Info
The expression solver for mt5 is a Library for MetaTrader 5 that expression solver class for mql5this script provides a class designed to solve mathematical and logical expressions defined as strings. it features two classes: ctokenbase and ctoken.
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 expression solver for mt5
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
expression solver class for mql5this script provides a class designed to solve mathematical and logical expressions defined as strings.
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: regular expressions in mq l5 for working with regular expressions - another powerful library for MetaTrader 5 traders.
expression solver class for mql5Also recommended: math utils - similar library with strong performance on MetaTrader 5.
this script provides a class designed to solve mathematical and logical expressions defined as strings. it features two classes: ctokenbase and ctoken. the ctokenbase class requires configuration before use.
supported mql5 operations:
logical and mathematical operations include: /, %, *, +, -, >, <, >=, <=, ==, !=, &&, ||.
expression components:
expressions can comprise numbers (including decimals), user-defined variables, and user-defined arrays. to use custom variables and arrays, you must implement functions that return their values and add them to the ctokenbase class. user variables and arrays are case-insensitively named with letters. array elements are accessed using the format: e[0], e[1], f[0], f[1].
configuration of ctokenbase class:
1. register user variables and arrays: in the usersvariables() function, list the names of user variables and arrays, separated by semicolons.
2. add function calls in userfunc(): include a call to the corresponding function within the userfunc(string funcname) function.
3. implement user variable functions: create functions for all user variables.
4. add array function calls in userarray(): for each array, add a call to the appropriate function within the userarray(string arrname, int aindex) function. the array element index is provided in the aindex variable.
5. implement array functions: create functions for each of the user-defined arrays.
using the class:
1. declare an external input variable for the expression.
2. declare a ctoken class variable at the global level.
3. initialize the class with the expression.
4. call the solveexpression() method.
multiple instances:
the class can solve multiple expressions. simply create separate instances of the ctoken class. all class instances will share the same user variables and arrays defined in the ctokenbase class.
adding custom functions:
1. register new functions: in the appropriate function, register the new function name.
2. implement calculation logic: add the calculation code to the solvefunc(string func, string & ares[]) function. the arguments for the function are provided in the ares[] array. there is no limit to the number of arguments.
version 2026
Source Code
#property copyright "robotfx"
#property link "https://robotfx.org"
#property description "this code is educational. feel free to use, modify and upgrade as you wish. visit robotfx.org for professional trading tools"
#property description "this code is educational. feel free to use, modify and upgrade as you wish. visit robotfx.org for professional trading tools"
#property description "this code is educational. feel free to use, modify and upgrade as you wish. visit robotfx.org for professional trading tools"
#property description "this code is educational. feel free to use, modify and upgrade as you wish. visit robotfx.org for professional trading tools"
#property script_show_inputs
input string expression1="a+b+c+d";
input string expression2="e[0]+e[1]+f[0]+f[1]";
input string expression3="((pow(5,2)+pow(10,2)+25)/30*2)*2/4-2*cos(0)";.......
⚠ 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.