tradingview pine limit

I am trying to write a script on Pine (related to a Tradingview strategy) where I want to use the series and take the previous value or past values to make a set of operations.

Something as:

a = if(Alerta1[-1] == 5, 10,0)

the pine script is saved without error, but during the execution, an error is shown:

Index can’t be a negative value (-1)

Is there anybody that could let me know how to solve it?

I would like to use “[-1]” and other “minus” such “[-20]” for a script.

many thanks in advance

The answer

The answer is as simple that I’m embarrassed of not being able to see it:

https://www.tradingview.com/pine-script-docs/en/v4/language/Operators.html#history-reference-operator

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