CopyRates() with unknown number of "count"

[Daniel Arges]

Masters,

Inside one Symbol indicator, in OnCalculate(), I need to bring volume information of another Symbol.

As I researched, I´ll need to use CopyRates(), but I don´t know the number of values I will need to bring from the another Symbol array.

How can I use CopyRates() without knowing this?

By the way, I will need to replicate the prev_calculated to this new series. Any clue how to do this?

Thanks

[William Roeder]

You know which candle index you are about to update. Use iBarShift to get the other symbol's shift. That (plus any look back) is what you need.