Barry:
Does this do what you want?
Sell = ... ;
lowestLowSinceSell = LowestSince( Sell, L, 1
);
Bill
----- Original Message -----
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 amibroker@xxxxxxxxxxxxxxx, "Steve
Dugas" <sjdugas@xxx> 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" <razzbarry@xxx>
>
To: <amibroker@xxxxxxxxxxxxxxx>
>
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();
> >
> >
> >
> >
------------------------------------
> >
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>
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