Your Regards
Michal

Well, it is your option whether you declare or not arrays so big. Thing is, you have to declare at least one-element array.
To get what you want, which is not prices, rather history access, you need to use the CopyRates() function.
For that, you have to declare an MqlRates array. The MqlRates is a structure itself containg high, low, close prices etc.
So when you get info with CopyRates you get them all in a single array.

CopyRates disregards the “as series” setup of your array. It will begin with the latest bar on the nth-1 position in the array, and will continue to the oldest bar which will be on 0 position in the array. Run this script for instance on a chart of your choice:

void OnStart()
{
MqlRates Rates[3];
ArraySetAsSeries(Rates,false); //set it to true also and retry
CopyRates(Symbol(),Period(),0,3,Rates);
Print(“Close[0]=”,Rates[0].close,” Open[0]=”,Rates[0].open);
Print(“Close[1]=”,Rates[1].close,” Open[1]=”,Rates[1].open);
Print(“Close[2]=”,Rates[2].close,” Open[2]=”,Rates[2].open);
}

Check all the syntaxes of CopyRates – it also allows selection based on dates, not only bar indexes.