[amibroker] Referencing the value in a previous bar

["dralexchambers" <dralexchambers@xxxxxxxxx>]

I have some code - below - that creates stop losses for each bar, 
then amends the stop loss of each buy signal (long trade entry day 
only) to that of the longsetup day.

LSUP = {Long setup condition here}

for (i=0; i<BarCount; i++)
{
	LongSetup[i] = LSUP[i]; 
	
	LongStop[i] = Low[i-1]- (Low[i-1] * 0.05);
}

Buy = Longsetup AND H>StopBuy;
BuyPrice = Max(Open,StopBuy);
Sell =  L < LongStop;


This section of code is where the problem is:


for (i=1; i<BarCount; i++)
{
 if (Buy[i]==1 AND Buy[i-1]==0)   	
	{Longstop[i] = ValueWhen(Longsetup[i],Longstop,1); } 
}


The code is giving me an error at:

{Longstop[i] = ValueWhen(Longsetup[i],Longstop,1); } 

"Error 8: Type mismatch, the value assigned to the array element has 
to be a number"


I would like this section of code to:

On the first day that a buy occurs only (ie. not 2nd, 3rd days in the 
buy) to amend the stop loss to that of the setup day.

Can anyone suggest?


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