How to Write a Custom Technical Indicator in MQL5
Custom indicators are one of the most practical ways to turn a trading idea into a repeatable, visual tool. While MetaTrader 5 ships with dozens of built-in indicators, sooner or later you will want something more specific: a specialized filter, a custom oscillator, a volatility regime detector, a bespoke “signal line,” or simply a cleaner visualization of existing information. This article explains—thoroughly and practically—how to write custom technical indicators in MQL5, with multiple working examples, performance patterns, and tables you can use as a reference. 1. What Makes an MQL5 Indicator Different From an Expert Advisor? Both indicators and Expert…