[amibroker] Help with coding PREV alternative

[Keith Osborne <kosborn3@xxxxxxxxxxxxxx>]

Hi, I am attempting to convert a Metastock formula with a PREV 
statement. I have read a number of messages in Amibroker database and my 
attempt is as follows.

IH_Periods = Param("Initial High", 21, 10, 100,1);

HH = IH_Periods - 1;

Z = HHV(H,HH);
Z = 0; // Initialize
for(i=1;i<BarCount;i++)
{
PREV = Z[i-1]; // PREV is previous value of Z.
}

When I use PREV in a AB formula such as iif(A > B, XX, PREV) I get 0 
(Zero) when A<B.......rather than the previous value of Z. Can I assign 
a HHV to Z?)

I hope I have explained this.

Any help would be appreciated.

TIA .... Keith

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