I'll give you a brief example: We are in the middle of trading session; Current C = 100 Current BBandBot( C, 20, 2 ) = 95 I want to set a limit order that buys if price falls bellow lower Bollinger band. However, a limit order at 94.99 would be incorrect way of doing that because when the price reaches 94, the actual lower Bollinger band would have shifted far below 94.99. Thus, I need to a dynamic calculation of lower Bollinger band that determines the true level.
--- In [email protected], "Ara Kaloustian" <a...@...> wrote: > > Dont really understand your comments ... as Low and Close frequently are > below lower BB... > > Try using L <= BBandBot(...) > > > ----- Original Message ----- > From: "mbausys" <mbau...@...> > To: <[email protected]> > Sent: Thursday, April 15, 2010 8:16 AM > Subject: [amibroker] Re: Change last value of array > > > > In essence, I want to backtest a trading system that uses lower Bollinger > > Band as an entry point and would enter trades intraday when price touches > > the lower band. However, I can't use L < BBandBot( C, 20, 2 ) as at the > > point when price is at its L, BBand would be lower than BBandBot( C, 20, > > 2 ) and the trade might be not triggered in reality. Therefore, I want to > > find price levels at which P would be equal or just fall below lower > > BBand. That level would be my BuyPrice as well. > > > > Thanks, > > > > Marius > > > > > > --- In [email protected], "Rob" <sidhartha70@> wrote: > >> > >> You said you only wanted to do it for the last day (or last value in the > >> array)...? > >> > >> LastValue() will only access the last value in the array hence will only > >> work for the last day... > >> > >> What exactly are you trying to do...? explain in detail and we might be > >> able to help... > >> > >> --- In [email protected], "mbausys" <mbausys@> wrote: > >> > > >> > I have this very short code, which is supposed to determine at what > >> > price level every day the price would have been equal to lower > >> > Bollinger Band. However, the code seems to do the trick only for the > >> > last day. Any hints where I may be wrong? > >> > > >> > P = C; // P is a target price level > >> > diff = P / 2; > >> > > >> > for( i = 0; i < 100; i++ ) > >> > { > >> > P = IIf( P < BBandBot( C, 20, 2 ), C + diff, C - diff ); > >> > C[ LastValue( BarIndex() ) ] = P[ LastValue( BarIndex() ) ]; > >> > diff = diff / 2; > >> > } > >> > > >> > --- In [email protected], "jooleanlogic" <jooleanl@> wrote: > >> > > > >> > > I think that will only work in version 5.3 Sid. > >> > > > >> > > BarIndex() changed from being the actual index in 5.2, to always > >> > > starting at 0 in 5.3. > >> > > So LastValue(BarIndex()) in 5.2 can give you a number greater than > >> > > BarCount under QuickAFL. > >> > > > >> > > You could just use BB_Array[BarCount-1] which will always work. > >> > > > >> > > Jules. > >> > > > >> > > > >> > > --- In [email protected], "Rob" <sidhartha70@> wrote: > >> > > > > >> > > > Sure... if BBand is the array you want to change, > >> > > > > >> > > > Last_Val_BI = LastValue( BarIndex()); > >> > > > BB_Array [Last_Val_BI] = New value here... > >> > > > > >> > > > try something like that. > >> > > > > >> > > > --- In [email protected], "mbausys" <mbausys@> wrote: > >> > > > > > >> > > > > Hi all, > >> > > > > > >> > > > > Is there a simple way of changing the last value of an array? > >> > > > > I want to find Bollinger Band of, e.g. 10 days of closing prices, > >> > > > > but would like to use a different value for day 10 rather than > >> > > > > the real closing price for that day. > >> > > > > > >> > > > > Any help would be appreciated. > >> > > > > > >> > > > > Many thanks, > >> > > > > > >> > > > > Marius > >> > > > > > >> > > > > >> > > > >> > > >> > > > > > > > > > > ------------------------------------ > > > > **** IMPORTANT PLEASE READ **** > > This group is for the discussion between users only. > > This is *NOT* technical support channel. > > > > TO GET TECHNICAL SUPPORT send an e-mail directly to > > SUPPORT {at} amibroker.com > > > > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at > > http://www.amibroker.com/feedback/ > > (submissions sent via other channels won't be considered) > > > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > > http://www.amibroker.com/devlog/ > > > > Yahoo! Groups Links > > > > > > > > >
