Help with arrays in PID

[hotbuttmud]

I am trying to set up a Proportional, Integral, Derivative program, and I need some help on derivative filtering. I want to add values to the end of an array until there are 20 elements total. From there, I want to use Array Push to keep the last 20 values. Any advise?

One other is, is there a short way to find the average value of those 20 values?

Edited June 9, 2011 by hotbuttmud

[hannes08]

Hi hotbuttmud,

well, use _ArrayPush() then.

Define a new array with 20 items (dim $array[20]) and then use _ArrayPush(). Example:

#include <array.au3>

Dim $a[20]

For $i = 0 To 30
    _ArrayPush($a, $i)
    ConsoleWrite(_ArrayToString($a) & @CRLF)
Next

Getting the average out of that array:

$k = 0
For $j = 0 To 19
 $k += $a[$i]
Next
ConsoleWrite("Average:" &  %k / 20)