how to run my robot on multiple pairs at a time?

[Loua Manga Arnaud]

Hello I designed a robot and I have trouble running it on several pairs at a time ...

  can you help me ?

[Code2219 or 2319]

Loua Manga Arnaud:

Hello I designed a robot and I have trouble running it on several pairs at a time ...

  can you help me ?

it can trade symbols given by input. (you can set an input string, entering each symbol you want to the EA to trade on, comma separated or so...)
then extract each symbol name from that string. and ideally store each symbol name in a string array. (as you don't know how many pairs are demanded by input.)

input string PAIRS = "EURUSD,USDJPY,AUDUSD";    // Pairs to trade :

or you can code the EA to work on all pairs in MarketWatch, or reasonably, filter the ones needed. (e.g. any pair containing CHF , and/or pair containing JPY , any pair with zero swap, etc.)

or other ways i'm not aware of.

If I was to use one, i'd use input method.

[Marco vd Heijden]

Hello please see: https://www.mql5.com/en/forum/61041

[William Roeder]

Loua Manga Arnaud: I designed a robot and I have trouble running it on several pairs at a time ...  can you help me ?

1. "Doesn't work" is meaningless - just like saying the car doesn't work. Doesn't start, won't go in gear, no electrical, missing the key, flat tires - meaningless. We can't see your broken code. There are no mind readers here and our crystal balls are cracked.

2. Help you with what? Show us your attempt (using CODE button) and state the nature of your problem.
             No free help
             urgent help.

3. I recommend: Do not trade multiple currencies in one EA.
   • You can't use any {MT4: predefined variables, MT5: predefined variables,}
   • MT4: can't use the tester.
   • must poll (not OnTick, unless you use specific indicators)
               The Implementation of a Multi-currency Mode in MetaTrader 5 - MQL5 Articles
   • and usually other problems, e.g. A problem with iBarShift - MQL4 and MetaTrader 4 - MQL4 programming forum - Page 2
   • You must handle History {MT4:4066/4073 errors: Download history in MQL4 EA - MQL4 and MetaTrader 4 - MQL4 programming forum , MT5: Timeseries and Indicators Access /  Data Access - Reference on algorithmic/automated trading language for MetaTrader 5.}
   • Code it to trade the chart pair only. Look at the others if you must. Don't assume that Time[i] == iTime(otherPair, TF, i) always use iBarShift (or MT5 equivalent.)
   • Then put it on other charts to trade the other pairs. Done.