MQL4 Programming Articles

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Here you can find articles on MQL4 - programming language of trading strategies. Most of them are written by traders and active members of MQL5.community. For more convenience, all articles are grouped into several categories - Experts, Indicators, Trading Systems, etc.

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Poll: Traders’ Estimate of the Mobile Terminal
Poll: Traders’ Estimate of the Mobile Terminal

Poll: Traders’ Estimate of the Mobile Terminal

Unfortunately, there are no clear projections available at this moment about the future of the mobile trading. However, there are a lot of speculations surrounding this matter. In our attempt to resolve this ambiguity we decided to conduct a survey among traders to find out their opinion about our mobile terminals. Through the efforts of this survey, we have managed to established a clear picture of what our clients currently think about the product as well as their requests and wishes in future developments of our mobile terminals.
MQL4  as a Trader's Tool, or The Advanced Technical Analysis
MQL4  as a Trader's Tool, or The Advanced Technical Analysis

MQL4 as a Trader's Tool, or The Advanced Technical Analysis

Trading is, first of all, a calculus of probabilities. The proverb about idleness being an engine for progress reveals us the reason why all those indicators and trading systems have been developed. It comes that the major of newcomers in trading study "ready-made" trading theories. But, as luck would have it, there are some more undiscovered market secrets, and tools used in analyzing of price movements exist, basically, as those unrealized technical indicators or math and stat packages. Thanks awfully to Bill Williams for his contribution to the market movements theory. Though, perhaps, it's too early to rest on oars.
Effective Averaging Algorithms with Minimal Lag: Use in Indicators
Effective Averaging Algorithms with Minimal Lag: Use in Indicators

Effective Averaging Algorithms with Minimal Lag: Use in Indicators

The article describes custom averaging functions of higher quality developed by the author: JJMASeries(), JurXSeries(), JLiteSeries(), ParMASeries(), LRMASeries(), T3Series(). The article also deals with application of the above functions in indicators. The author introduces a rich indicators library based on the use of these functions.
What Is a Martingale?
What Is a Martingale?

What Is a Martingale?

A short description of various illusions that come up when people trade using martingale betting strategies or misuse spiking and the like approaches.
Testing Visualization: Trade History
Testing Visualization: Trade History

Testing Visualization: Trade History

The article describes the possibilities of convenient viewing the trade history when visualizing tests. Starting from build 196, MetaTrader 4 Client Terminal offers testing visualization function. It allows controlling the Expert Advisors' testing on a brand new level. Now, the trading programmer can watch every action of his or her Expert Advisor checking its operation on history!
Beginners' Mistakes when Working with MetaTrader 4 Client Terminal
Beginners' Mistakes when Working with MetaTrader 4 Client Terminal

Beginners' Mistakes when Working with MetaTrader 4 Client Terminal

Err is human. Everybody makes mistakes: more or less frequently, through ignorance or inadvertently. You ask and we answer your questions about: terminal time, test results, Print in journal, symbols, history for Tester, history import, leverage, traffic, hints, scaling, wrong calculations, Invalid account, Empty News, Price changed, Not Enough Money, Market Is Closed.
Secrets of MetaTrader 4 Client Terminal: File Library in MetaEditor
Secrets of MetaTrader 4 Client Terminal: File Library in MetaEditor

Secrets of MetaTrader 4 Client Terminal: File Library in MetaEditor

When creating custom programs, code editor is of great importance. The more functions are available in the editor, the faster and more convenient is creation of the program. Many programs are created on basis of an already existing code. Do you use an indicator or a script that does not fully suit your purposes? Download the code of this program from our website and customize it for yourselves.
Orders Management - It's Simple
Orders Management - It's Simple

Orders Management - It's Simple

The article deals with various ways of how to control open positions and pending orders. It is devoted to simplifying of writing Expert Advisors.
Trading Strategies
Trading Strategies

Trading Strategies

All categories classifying trading strategies are fully arbitrary. The classification below is to emphasize the basic differences between possible approaches to trading.
Ten Basic Errors of a Newcomer in Trading
Ten Basic Errors of a Newcomer in Trading

Ten Basic Errors of a Newcomer in Trading

There are ten basic errors of a newcomer intrading: trading at market opening, undue hurry in taking profit, adding of lots in a losing position, closing positions starting with the best one, revenge, the most preferable positions, trading by the principle of 'bought for ever', closing of a profitable strategic position on the first day, closing of a position when alerted to open an opposite position, doubts.
Multiple Null Bar Re-Count in Some Indicators
Multiple Null Bar Re-Count in Some Indicators

Multiple Null Bar Re-Count in Some Indicators

The article is concerned with the problem of re-counting of the indicator value in the MetaTrader 4 Client Terminal when the null bar changes. It outlines general idea of how to add to the indicator code some extra program items that allow to restore program code saved before multiple re-counting.
Secrets of the MetaTrader 4 Client Terminal: Indicators
Secrets of the MetaTrader 4 Client Terminal: Indicators

Secrets of the MetaTrader 4 Client Terminal: Indicators

Are you going to write your own indicator? Perhaps you will find that what you need among indicators already embedded in the client terminal. So why to reinvent the wheel? A summary table of integrated indicators' characteristics; special features and methods of attaching indicators to a chart; building of levels; displaying of indicators on different timeframes.
Secrets of MetaTrader 4 Client Terminal: Alerting System
Secrets of MetaTrader 4 Client Terminal: Alerting System

Secrets of MetaTrader 4 Client Terminal: Alerting System

How to be aware of what happens in the terminal and on your account without permanent looking at the monitor. System events; custom events; wave and executable files; electronic messages; setting up SMTP server access; publications; setting up FTP server access.
Secrets of MetaTrader 4 Client Terminal
Secrets of MetaTrader 4 Client Terminal

Secrets of MetaTrader 4 Client Terminal

21 way to ease the life: Latent features in MetaTrader 4 Client Terminal. Full screen; hot keys; Fast Navigation bar; minimizing windows; favorites; traffic reduction; disabling of news; symbol sets; Market Watch; templates for testing and independent charts; profiles; crosshair; electronic ruler; barwise chart paging; account history in the chart; types of pending orders; modifying of StopLoss and TakeProfit; undo deletion; chart print.
My First "Grail"
My First "Grail"

My First "Grail"

Examined are the most frequent mistakes that lead the first-time programmers to creation of a "super-moneymaking" (when tested) trading systems. Exemplary experts that show fantastic results in tester, but result in losses during real trading are presented.
A Pause between Trades
A Pause between Trades

A Pause between Trades

The article deals with the problem of how to arrange pauses between trade operations when a number of experts work on one МТ 4 Client Terminal. It is intended for users who have basic skills in both working with the terminal and programming in MQL 4.
MagicNumber: "Magic" Identifier of the Order
MagicNumber: "Magic" Identifier of the Order

MagicNumber: "Magic" Identifier of the Order

The article deals with the problem of conflict-free trading of several experts on the same МТ 4 Client Terminal. It "teaches" the expert to manage only "its own" orders without modifying or closing "someone else's" positions (opened manually or by other experts). The article was written for users who have basic skills of working with the terminal and programming in MQL 4.
Information Storage and View
Information Storage and View

Information Storage and View

The article deals with convenient and efficient methods of information storage and viewing. Alternatives to the terminal standard log file and the Comment() function are considered here.
Genetic Algorithms: Mathematics
Genetic Algorithms: Mathematics

Genetic Algorithms: Mathematics

Genetic (evolutionary) algorithms are used for optimization purposes. An example of such purpose can be neuronet learning, i.e., selection of such weight values that allow reaching the minimum error. At this, the genetic algorithm is based on the random search method.
Expert Advisor Sample
Expert Advisor Sample

Expert Advisor Sample

The principles of MQL4-programs development are shown on sample of creating a simple Expert Advisor system based on the standard MACD indicator.
Strategy Tester: Modes of Modeling during Testing
Strategy Tester: Modes of Modeling during Testing

Strategy Tester: Modes of Modeling during Testing

Many programs of technical analysis allow to test trading strategies on history data. In the most cases, the testing is conducted on already completed data without any attempts to model the trends within a price bar. It was made quickly, but not precisely