[amibroker] simple High value question

[Noah Bender <knowabender@xxxxxxxxx>]

Here is a simple question. 

I am trying to code this -HHV (highest bar) of previous 20 bars from signal bar . 

Meaning once I have a signal bar I would like to find the high value of the previous 20 bars before the signal bar. 

anyone know how to code that? I am sure it is not to hard  

thanks 

noah 

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