Barry: Does this do what you want?
Sell = ... ; lowestLowSinceSell = LowestSince( Sell, L, 1 ); Bill ----- Original Message ----- From: Barry To: [email protected] Sent: September 21, 2009 7:46 PM Subject: [amibroker] Re: Help understanding array processing What I am trying to do is find the lowest low from the last sell so I can calculate a buy point above that low, or below the high for a sell. The first problem I ran into was what to do before the first trade. I used highest and lowest but afterward I wanted to use hhv and llv. Ami goes nuts when I try to reference buy and sell before they are ever set. So barssince returned nulls for all bars. Marcin told me I had to use loops. I remember loops really slowing things down so I tried to do it another way. I tried to set my test hi and low arrays one step at a time. The hi and lo just followed the close. I was expecting it to operate one bar at a time. That did not work as you pointed out. I finally said to heck with it and used loops. I am used to arrays in C++ and I really get screwed up with Ami's arrays. Do you know if looping slows the process down a lot or does Ami only go back far enough to load the indicators correctly? I remember seeing something like that. Thanks Steve, Barry --- In [email protected], "Steve Dugas" <sjdu...@...> wrote: > > Hi - I think you have run into the old "recursive" problem. In the first > line... > > theHi[0] = C[0]; > > you set only the first bar of the Hi to the close. Don't know what the rest > of the array is offhand, AB may initialize it to zero or null or something, > otherwise I would think the values are whatever was previously in memory. > Then the second line operates on the entire array at once so it will use > whatever those values of theHi are at that point, it will *not* do one bar > at a time and then refer back to that bar, I think that is one reason why TJ > added looping. > > It looks like you are looking for the highest Close in the array, could you > just use > > Highest( Close) ? > > Steve > > ----- Original Message ----- > From: "Barry" <razzba...@...> > To: <[email protected]> > Sent: Monday, September 21, 2009 5:25 PM > Subject: [amibroker] Help understanding array processing > > > >I am not new to Ami, been using it since 2003. But at times the array > >processing drives me nuts. I tried to use barssince and looked at the buy > >and sell arrays before they were set. so they were still nulls even when I > >initialized them to buy = sell = 0; > > > > But to try to understand what the arrays were doing I wrote a stupid > > little program to see what was going on. The code is below. > > > > What I am trying to do is save the highest hi in an array called theHi. I > > set the first cell in theHi to the value of in the first cell of the > > close. Then I compare them but theHi follows the close even when the > > close goes down. > > > > Then I wrote the same function in a for loop and it works fine. > > > > Then I added the formula to Excel and it worked correctly. > > =IF(C3>D2,C3,D2) where C has the close and D the hi array values. Here I > > also set the hi in cell 2 to the first value of Close. > > SO excel works fine with the same formula as Afl but Afl fails. > > > > I must be missing something really basic. Can anyone tell me why Ami won't > > allow me to scan through the close array and save the high? > > > > Thanks, > > Barry > > > > _SECTION_BEGIN("TestBarsSince"); > > > > _N(Title = StrFormat("BarsSince test - {{INTERVAL}} {{DATE}} \nOpen %g, Hi > > %g, Lo %g, Close %g (%.1f%%) Vol " +WriteVal( V, 1.0 ) +" {{VALUES}}", O, > > H, L, C, SelectedValue( ROC( C, 1 )) )); > > > > Plot( C, "Close", ParamColor("Color", colorBlack ), styleNoTitle | > > styleBar ); // shows all style options > > > > theHi[0] = C[0]; > > theHi = IIf(C > Ref(theHi, -1), C, Ref(theHi, -1)); > > Plot(theHi, "\nTheHi", colorBlue ); > > > > forHi[0] = C[0]; > > for (i = 1; i < BarCount; ++i) > > { > > if(C[i] > forHi[i-1]) forHi[i] = C[i]; else forHi[i] = forHi[i-1]; > > } > > > > Plot(forHi, "\nHi with for loop", colorGreen); > > > > _SECTION_END(); > > > > > > > > ------------------------------------ > > > > **** 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
