Unless you use zero Blank bars in the right Margin this type of code
may not always work correctly, you can add an offset to the last bar
index() to correct for this (set to 4 in the demo code below). AFAIK,
we cannot set/read the number of blank bars set in preferences
so you will have to remember to set this properly in you formulas.
The need for SetBarsRequired() in this application may also confuse
some users. When Applying a formula AB scans all bars and if you don't
use SetBarsRequired() this can generate transient conditions. This may
be a concern if you are real time trading from the indicator.
If you get confusing results it is always a good habit to write some
test code as shown below. In fact, I have a folder in my chart-tree for
just such small test programs :-)
Plot(C,"",1,128);
SetBarsRequired(1000000,1000000);
BlankBarsInRightMargin = 4;
Plot(BarIndex()==Status("FirstVisibleBar"),"",5,styleArea|styleOwnScale,-10,10);
Plot(BarIndex()==Status("LastVisibleBar")-BlankBarsInRightMargin,"",4,styleArea|styleOwnScale,-10,10);
Title = "\n"+
"SelectedBarIndex: "+NumToStr(BarIndex(),1.0)+"\n"+
" FirstBarIndex: "+NumToStr(Status("FirstVisibleBar"),1.0)+"\n"+
" LastBarIndex: "+NumToStr(Status("LastVisibleBar"),1.0);
best regards,
herman
Fred wrote:
HVC = Highest(ValueWhen(BarIndex() >= Status("FirstVisibleBar") AND
BarIndex() <= Status("LastVisibleBar"), C));
--- In amibroker@yahoogroups.com, "wavemechanic" <[EMAIL PROTECTED]> wrote:
Wayne:
I just took a look at your code. For starters, you are setting
Begin and End to BarIndex() and, as a result numBars = 1. I don't
think that is what you want.
Bill
----- Original Message -----
From: "wlandry01" <[EMAIL PROTECTED]>
To: <amibroker@yahoogroups.com>
Sent: Tuesday, August 29, 2006 12:09 PM
Subject: [amibroker] Re: Need Help With FirstVisibleBarIndex
Thomas/WaveMechanic,
Thanks for the input - very helpful. Part of my confusion is that
my
understanding was that "firstvisiblebarindex" returns the barindex
value of the first bar visible, and that "firstvisiblebar"
returns a
"1". If "firstvisiblebarindex" returns a "1", how does it differ
from
"firstvisiblebar"?
Also, haven't gotten this to work yet. When I run an Exploration
on
RedHat (RHAT), for example, I get a "HighValue" of 143.12, for all
dates since 12/09/1999. This tells me that the "HighValue"
calculation is not restricted to "NumBars", but is applied across
the
entire data history for RHAT.
There are, no doubt, several problems, but it is likely that I
still
don't have the NumBars calculation correct. Unless I can get that
straight the rest certainly won't work.
Following is what I currently have, based on your joint comments:
Begin=ValueWhen(Status("firstvisiblebarindex"),BarIndex());
End=ValueWhen(Status("lastvisiblebarindex"),BarIndex());
NumBars=LastValue(End-Begin+1);
HighValue=HHV(C,NumBars);
TestValue=0.9*HighValue;
Plot(C,"Close",colorLightGrey,styleHistogram|styleThick);
PlotGrid(LastValue(TestValue),colorDarkRed);
AddColumn(C,"Close",format=1.2);
AddColumn(HighValue,"HighValue",format=1.2);
AddColumn(TestValue,"TestValue",format=1.2);
AddColumn(NumBars,"NumBars",format=1.2);
Filter=1;
On a side note, it seems I've noticed that some, if not all, of
the
"bar" statuscodes will not output to the Exploration window.
Could it
be that the "NumBars" calculation is correct but is outputting
a "1"
or "0" since it's using codes that are not used in the
Exploration module?
If you have any ideas, please let me know.
Thanks,
Wayne
--- In amibroker@yahoogroups.com, "wavemechanic" <fimdot@> wrote:
Wayne:
Your numBars is "backwards" and needs to subtract Begin from End
otherwise you have a negative number. Also, the only place that
you
need LastValue is in the HighValue line. So this should work:
numBars = (end - begin + 1);
highValue = LastValue(C, numBars);
testValue = .9 * highValue;
----- Original Message -----
From: "wlandry01" <wlandry01@>
To: <amibroker@yahoogroups.com>
Sent: Tuesday, August 29, 2006 9:19 AM
Subject: [amibroker] Need Help With FirstVisibleBarIndex
Hi,
I'm trying to set up an indicator that will calculate the HHV
for the
current chart so that I can do a PlotGrid at 90% of that
highest value
shown on the chart. I thought the following would do this:
//Calculate the Number of Bars Shown on the Current Chart
Begin=Status("firstvisiblebarindex");
End=Status("lastvisiblebarindex");
NumBars=LastValue(Begin-End+1);
//Determine the HHV of the Chart and Calculate 90% of that
Value
HighValue=HHV(C,NumBars);
TestValue=0.9*LastValue(HighValue);
//Plot the Result
PlotGrid(TestValue,ColorDarkRed);
It appears, however, that the "Begin" and "End" values are not
returning the index values associated with the chart. As far
as I can
tell, I'm getting "1" for all values. I can't for the life of
me
understand what the problem might be.
Any help would be greatly appreciated.
Wayne
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