Buy/Sell/Short/Cover should be arrays and every bar has one value,
but I cannot see them on the Watch window, please help, thank you very much.
The variable type in AFL is dynamic (i.e. can change) if you assign a different value. For example:
Buy = Close > Open; // now Buy is an array
Buy = 0; // now Buy is a number (scalar)
For more information see:
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