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ST function FOR TO statement

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Hi all,

maybe have a stupid question, but do not understand. I try to define a MovingAverage function in ST:

FUNCTION MovingAverage
        Values:    ARRAY[0..4] OF DINT;
        NewValue:    DINT;
        Result:    DINT;
        Sum:    DINT;
    (* User code starts below this comment *)
    FOR i := 4 TO 1 DO
       Values[i] := Values[i-1];
       Sum := Sum + Values[i];
    Values[0] := NewValue;
    Sum := Sum + NewValue;
    Result := Sum/5;
    (* User code ends above this comment *)

But this does not work for me (the values are not changed. But if I use instead of  "FOR TO DO" primitive def like

Values[4] := Values[3];

Values[3] := Values[2];




etc. it works.

Can somebody explain it to me?

Thx. Jan



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