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How to Write an Expert Advisor or an Indicator

MQL4 Source Code Library for MetaTrader 4 - 75

The largest library features codes of free trading Expert Advisors, technical indicators and scripts. With the available applications you can trade in automated mode and analyze price dynamics. Use the library of codes to learn more about financial market sentiments.

Download free applications, test them and run in your MetaTrader 4. You can access them from the MetaTrader 4 platform and the MetaEditor development environment.

latest|best

LW Fractals indicator.

Indicator BBands Stop v1

Indicator BB-HL

Indicator B WImp - T01.

StoneAxe_x4x indicator.

Simply MA wrong indicator.

NR4ID-ATR indicator.

A maximally optimized algorithm of constructing Kaufman AMA (Adaptive Moving Average).

The fractal dimension value is used to build an EMA-like moving average.

Volatility is a standard deviation.

It measures all sections that join the ZigZag breaks, the resulting values are given in points.

NRMA is the famous indicator by Konstantin Kopyrkin.

The volatility indicator by Chaikin accounts for the spread changes between the maximal and minimal prices. It defines the volatility value based on the range width between the maximum and minimum.

Zigzag2_R_ is a variant of the indicator Zigzag with an added option of drawing two extremums on one bar.

Chaikin Oscillator (CHO). Based on the book by Eric. L. Nyman Malaya entsiklopedia treidera (Small Encyclopedia of Trader)

Accumulative Swing Index is used to analyze futures.

A variation of a well-known Nick Rypock Trailing Reverse indicator.

The script pumps over all quotations.

Library of functions usefull for time calculations and determining if a report is imminent.

Functions for processing the orders of Spot currency pairs, Spot Gold and Spot Silver with error handling.

RoundPriceExp indicator.

Advisor True Scalper Profit Lock.

TradePrice-T03 indicator.

The indicator shows the channel

Pivot RS Session indicator. Shows trading sessions.

The indicator shows the channel

Fib SR indicator.

CwlxBW5Zone indicator.

Indicator BBand Width Ratio.

Indicator i-RoundPrice-T01m

Indicator iFXAnalyser

Indicator iMA Cross

Indicator iMA Fibs.

At_Itp(t)Env indicator.

Advisor Trend Me Leave Me.

The indicator shows the channel.

KLines indicator.

Absolute Strength_v1 indicator.

The Expert Advisor creates equivolume charts using tick history.

The Expert Advisor collects tick history for specified symbols into csv-files.

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