Hello,
I have a simple system I want to test in the systems tester but having trouble with the code.
It is based on Bollinger Bands with the paramaters (Price=CLOSE Period=62 Deviations=0.2 and Displacement =0). It can be a system for both long and short however, I just wan to test for long trades.

Buy: The price should begin entirely under the BBandBottom. That is, there needs to be a candle where no part of the candle is touching the BBandBottom and it is bellow that price. Then there needs to be the opposite candle above the bands and where no part is touching BBandTop. [Any number of candles can exist between these two candles.] The enrty is the following day at open as long as the open is still above the BBandTop.

There is a clause to sell for profit and also a stop loss, both based on the width of the BBands. In other words the BBandTop - BBandBottom.

The stop loss is {entry price - (BBandTop-BBandBottom)} and the Sell is {entry price + ((BBandTop-BBandBottom)*2)}

I came up with the below code for a buy order but not sure how to put in a clause "if open is above BBTop" It's confusing because I have already put in info about 'open' and it relates to the previous candle, so how do I talk about the future open?
(CLOSE >(BBandTop(CLOSE, 62, SIMPLE, .2)))
AND (OPEN >(BBandTop(CLOSE, 62, SIMPLE, .2)))
AND (LOW >(BBandTop(CLOSE, 62, SIMPLE, .2)))
AND (HIGH >(BBandTop(CLOSE, 62, SIMPLE, .2)))

I am also not sure how to write the code for the 'entry price' so I cannot write either of the sell conditions.

Thanks in advance.
James.

Your request was interesting, but a bit beyond my skill level, so I asked Roy Larsen (MSTT) to have a look -- here is what he came up with:

{BB System}
D:=Input("Deviations",0.1,10,.2);
N:=Input("Periods",2,500,62);
BT:=BBandTop(C,N,S,D);
BB:=BBandBot(C,N,S,D);
A:=L>BT; {LOW > BBtop}
B:=H<BB; {HIGH < BBbot}
BW:=BT-BB; {BBands width}
I:=Cum(IsDefined(A+B))<3; {2-bar Init signal}
N:=BarsSince(I+A)<BarsSince(I+B) {BB position latch}
AND Cum(B)>0; {inhibit latch B TRUE once}
Buy:=Ref(N*Alert(N=0,2),-1) {truncate buy signal and delay entry}
AND O>Ref(BT,-1); {check entry price is valid}
BP:=ValueWhen(1,I+Buy,O); {buy price}
{BP set by 2nd I bar to stop N/A flow-on effect on Sell, Stop and Tr variables}
Sell:=C>BP+BW*2; {profit exit}
Stop:=C<BP-BW; {stop loss exit}
Tr:=If(PREV<=0,Buy*O,If(Sell+Stop,-PREV,PREV)); {trade latch variable}
Exit:=Tr<0; {sell on CLOSE signal}
Abs(Tr); {entry price / active trade}


If you use this with the System Tester, I suggest you use the following for signals:

BUY: FmlVar("BB System","Buy");
SELL: FmlVar("BB System","Exit");