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Hi All,
I want to obtain the first and last visible bars on the display so
that I can re-calculate the indicators just for that portion of the
data, i.e., only for what is showing. This is an attempt to speed up
the display of results by not re-calculating the indicators for the
entire time series.
>From the forums, STATUS is clearly the right function to use.
However, I must be missing something, because the values output by
STATUS don't match the index numbers of the first and last visible
bars. In fact, if I don't select a date/bar, yet move the scroll
slider to view different portions of the time series, the output
values remain constant, as if I was still looking at the very end of
the data series.
(BTY, I am using AB 4.90.5, May 27, 2007; Windows XP SP2. )
Here is what I added to my afl chart equations, just before calling
the function with which I want to calculate just the data to display.
printf("\nStatus Info\n" );
printf( "1stVB = " + Status( "firstvisiblebar" ) + "\n" );
printf( "LstVB = " + Status( "lastvisiblebar" ) + "\n" );
printf( "1stVBI = " + Status( "firstvisiblebarindex" ) + "\n" );
printf( "LstVBI = " + Status( "lastvisiblebarindex" ) + "\n" );
Here is typical output in Interpretative Window
Status Info
1stVB = 1749
LstVB = 1926
1stVBI = 1749
LstVBI = 1926
1926 (+1) is the number of bars in the time series, i.e., BarCount ==
1927.
1749 seems to be related to the default number of bars displayed,
which is 159, plus 10 blank bars in right margin. However, the
different is 177, or 178 bars (= 1926 - 1749 + 1). I assume this pads
a little on the Left (~18 bars) for indicator startup transients.
When I first started checking the STATUS output, I had SetBarsRequired
commented out. And the 1st and last visible bars (VB) showed numbers
like 59 and 217 (difference is 159), while the VBI numbers were as
above. Once I used SetBarsRequired, however, it did not matter what
parameters I used or even if I removed SetBarRequired. The VB and VBI
values remained identical, as above.
If I pulled the scoll bar at the bottom to the left, back in time, the
above values did not change. It was as if I was still looking at the
end of the times series.
If I selected a bar, the "last" values do change, however, they
changed to the index of the selected bar, not the index of the last
bar on the right side of the display. And the first values changed to
a value 177 less than the last values, even if I selected a bar near
the left side of the display.
Oh yes, I can zoom in or out and the output values do not change, even
with the doubling or halving of the display.
So, I am not getting the literal left and right sides of the display,
even allowing for padding.
Would appreciate any guidance.
Chester
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