For a new bar test, Bars is unreliable (a refresh/reconnect can change number of bars on chart), volume is unreliable (miss ticks), Price is unreliable (duplicate prices and The == operand. - MQL4 programming forum.) Always use time.
New candle - MQL4 programming forum #3 2014.04.04
I disagree with making a new bar function, because it can only be called once per tick. A variable can be tested multiple times.
Running EA once at the start of each bar - MQL4 programming forum 2011.05.06
Bars[1]- previous bar.
Close[1] -previous close.
Aleksandr Morozov:
What parts of “volume is unreliable” and “Price is unreliable” was unclear to you?
Bars[1]- previous bar.
Close[1] -previous close.

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Hello,
I have an indicator that runs really heavy. Instead of it calculating every tick i want it to calculate once only when the bar closes. Is there a quick way to do this (like there is in ninjatrader etc) where you can tell it to run only when the bar closes? Eg. if it's a 15 min bar, the values get calculated 4 times an hour and not for every tick.