When you get the value of BBand, it is a dynamic value ... so in your example of C = 100 and BBand = 95, the buy order would of course be somewhere below 95. The point would be determined correctly by either:
L < BBand or Cross(BBand,L); If you are cornerned about the buy price being far below 95 (in the example), then perhaps you should use a different strategy, as BBands will shift with price moves ----- Original Message ----- From: "mbausys" <[email protected]> To: <[email protected]> Sent: Thursday, April 15, 2010 8:49 AM Subject: [amibroker] Re: Change last value of array > 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 >> > >> > >> > >> > >> > > > > > ------------------------------------ > > **** 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 > > >
