Is NewTick event only generated corresponding to a single currency pair ??

Alain Verleyen 2017.07.27 09:49 #1

27cc09:

I have a few related questions:

1) I'm not sure if a tick contains the information for only one currency pair (i.e. the one in current chart) or all the pairs available from the dealers?

Only current chart symbol.

2) If the former is true, what if the EA is designed to process new ticks from multiple currency pairs and requires OnTick function to be called when a tick for any pair of interest arrives?

You need to be creative. Several solutions. See below article for example.

3) In the MT4 backtest centre, in the drop down list for "Symbol", some entries have the same pair, others have different ones. What does that mean?

What do you mean ? All entries are different, one for each symbol (selected in the Market Watch).

The Implementation of a Multi-currency Mode in MetaTrader 5

2011.02.18
Konstantin Gruzdev
www.mql5.com

For a long time multi-currency analysis and multi-currency trading has been of interest to people. The opportunity to implement a full fledged multi-currency regime became possible only with the public release of MetaTrader 5 and the MQL5 programming language. In this article we propose a way to analyze and process all incoming ticks for several symbols. As an illustration, let's consider a multi-currency RSI indicator of the USDx dollar index.

Max Currencies Per EA Get the selected symbols Does an EA use

27cc09 2017.07.27 10:33 #2

Alain Verleyen:
Only current chart symbol.
You need to be creative. Several solutions. See below article for example.

What do you mean ? All entries are different, one for each symbol (selected in the Market Watch).

Hi Alain,

Regarding your answer to Q2, a further question is: when a new tick (say XAUUSD is the current chart symbol) arrives, if I call iOpen("GBPUSD"), I can have access to an array of prices for GBPUSD yes? or can I? If I can have access to GBPUSD, when does it get updated?

Regarding Q3, if you look at the attached figure, each entry in the drop down list contains two pairs, something like "XAUUSD, Gold" or "BCOUSD, Brent Crude Oil". I am not sure what this combination means.

Thanks a lot!

FOREX - Trends, forecasts Multi pair indicators Is there a series

William Roeder 2017.07.27 13:28 #3

27cc09:

Regarding your answer to Q2, a further question is: when a new tick (say XAUUSD is the current chart symbol) arrives, if I call iOpen("GBPUSD"), I can have access to an array of prices for GBPUSD yes? or can I? If I can have access to GBPUSD, when does it get updated?

Regarding Q3, if you look at the attached figure, each entry in the drop down list contains two pairs, something like "XAUUSD, Gold" or "BCOUSD, Brent Crude Oil". I am not sure what this combination means.

There is no iOpen function in ML5. Why did you post your MT4 question in the Root / MT5 EA section instead of the MQL4 section, (bottom of the Root page?)

General rules and best pratices of the Forum. - General - MQL5 programming forum

Of course you can. Unless the chart is that specific pair/TF, you must handle 4066/4073 errors.
Either at the start of OnTick: Download history in MQL4 EA - MQL4 and MetaTrader 4 - MQL4 programming forum
Or after the Copy functions What are Function return values ? How do I use them ? - MQL4 and MetaTrader 4 - MQL4 programming forum
Common Errors in MQL4 Programs and How to Avoid Them - MQL4 Articles
Symbol, comma, description. XAUUSD is the symbol for Gold.

Different currency pair data How to get the Wrong numerical result?

Alain Verleyen 2017.07.27 13:50 #4

27cc09:

Hi Alain,

Regarding your answer to Q2, a further question is: when a new tick (say XAUUSD is the current chart symbol) arrives, if I call iOpen("GBPUSD"), I can have access to an array of prices for GBPUSD yes? or can I? If I can have access to GBPUSD, when does it get updated?

It's updated as every pair, a new candle on first tick, so you could have to synchronize your symbols.

Regarding Q3, if you look at the attached figure, each entry in the drop down list contains two pairs, something like "XAUUSD, Gold" or "BCOUSD, Brent Crude Oil". I am not sure what this combination means.

Thanks a lot!

It's not 2 pairs, it's the "short" name and full name.

27cc09 2017.07.27 13:55 #5

whroeder1:

Of course you can, but you must handle 4066/4073 errors.
Symbol, comma, description. XAUUSD is the symbol for Gold.

Hi whroeder1,

Regarding your answer #1, if the EA only gets ticks for the current chart symbol, say XAUUSD (as said by Alain), does that mean calling iOpen("GBPUSD",shift=0) will only return the latest price (not necessarily up to date) available in the historical data centre if any?

If that is correct, can I do the following:

In a backtest-only scenario, assuming that historical data of both XAUUSD and GBPUSD are available for the backtest time span, the EA is tested on XAUUSD. When OnTick is called, if it is the first tick of a new bar, I can then check close price of the previous bar for GBPUSD by using iClose("GBPUSD")

Thank you!

Bug in bar shift Openning orders in the iClose() issue when backtesting

nicholish en 2017.07.27 15:26 #6

27cc09:

Hi whroeder1,

Regarding your answer #1, if the EA only gets ticks for the current chart symbol, say XAUUSD (as said by Alain), does that mean calling iOpen("GBPUSD",shift=0) will only return the latest price (not necessarily up to date) available in the historical data centre if any?

If that is correct, can I do the following:

In a backtest-only scenario, assuming that historical data of both XAUUSD and GBPUSD are available for the backtest time span, the EA is tested on XAUUSD. When OnTick is called, if it is the first tick of a new bar, I can then check close price of the previous bar for GBPUSD by using iClose("GBPUSD")

Thank you!

You can't backtest multiple instruments at the same time from one EA in MT4 but you can in MT5. (don't expect meaningful results if you're testing an arb strat)

When I trade multiple pairs on MT4 I use OnTimer() with a ~10-100ms refresh. I also don't use the iTimeSeries functions, but rather the newer CopyRates() with rate structs as they (my understanding) update live rates info from the platform when called.

MT4 visual mode using Testing multiple instruments on Kurka Trader - GREED

Alain Verleyen 2017.07.27 17:11 #7

27cc09:

Hi whroeder1,

Regarding your answer #1, if the EA only gets ticks for the current chart symbol, say XAUUSD (as said by Alain), does that mean calling iOpen("GBPUSD",shift=0) will only return the latest price (not necessarily up to date) available in the historical data centre if any?

If that is correct, can I do the following:

In a backtest-only scenario, assuming that historical data of both XAUUSD and GBPUSD are available for the backtest time span, the EA is tested on XAUUSD. When OnTick is called, if it is the first tick of a new bar, I can then check close price of the previous bar for GBPUSD by using iClose("GBPUSD")

Thank you!

You can access all history data available for all symbols available. On the strategy tester you need to get needed data BEFORE running your tests.

However as said by @nicholishen you can trade only 1 symbol with MT4 Strategy tester.

Using past ticks in Download and sheck historical Question about strategy tester.