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thanks Graham.
I also found the description in the help file
although BarCount is not defined in the help files. I use BarCount for all my
loopings and I did not have any problems that I am aware of.
Still, I would like to know how it is defined. In
my chart clicking on the last bar, WriteVal(BarCount) prints 175. Then when I
move the cursor to the first bar inside this chart it prints 299. Indeed I went
back 124 bars since WriteVal(LastValue(BarIndex()); prints 2899 and
WriteVal(BarIndex()); prints 2775. So it appears that this charts shows 124
bars. How do I get the number 175 for WriteVal(BarCount) when I click on
the last bar in the chart?
regards, Ed
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
<A title=gkavanagh@xxxxxxxxxxxxx
href="">Graham
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Saturday, October 25, 2003 11:29
AM
Subject: RE: [amibroker] size of an array
in AFL?
I recall some added rider to using Barcount when it was
introduced, I thinkyou had to turn off QuickAFL for Indicators in the
preferences, but I am notabsolutely certain of this.From the Help
filesBarCount constant gives the number of bars in array (such as
Close, High,Low, Open, Volume, etc). Array elements are numbered from 0
(zero) toBarCount-1. To get the first bar you can use array[ 0 ], to
get the last bar of arrayyou can use array[ BarCount - 1 ];For
example:Close[ 5 ];Represents the sixth element (bar) of the close
array.Close[ 0 ];Represents the very first available bar of the close
array.High[ BarCount - 1 ];Represents the last bar of High array.
This example illustrates the for statement:myema[ 0 ] = Close[ 0
]; for( i = 1; i < BarCount; i++ ){ myema[ i ] = 0.1 *
Close[ i ] + 0.9 * myema[ i - 1 ];}Cheers,Graham<A
href="">http://groups.msn.com/ASXShareTrading<A
href="">http://groups.msn.com/FMSAustralia
-----Original Message-----From: Ed [mailto:pablito@xxxxxxx] Sent:
Saturday, 25 October 2003 5:16 PMTo: amibroker@xxxxxxxxxxxxxxxSubject:
Re: [amibroker] size of an array in AFL?to my knowledge:
LastValue(BarIndex()): gives the number of bars available for the
symbolBarIndex(): gives the bar number counting from the first bar
available forthe symbol.I'm a bit confused about BarCount though.
I always thought that BarCount:gives the number of bars inside an
indicator window. So the first bar showninside the window is bar-number
0.However, I put inside the indicator
builder:WriteVal(BarCount);WriteVal(LastValue(BarIndex());WriteVal(BarIndex());The
last 2 do as expected. WriteVal(LastValue(BarIndex()); always gives
youthe total number of bars available for a symbol. WriteVal(BarIndex());
givesyou the index of the bar and its output changes when you move the
cursorwith the amount of bars you move the cursor back.However
BarCount behaves differently. Actually if a symbol has 2900
barsWriteVal(BarCount); prints 2900 if you put the cursor on any bar if
you showALL data in the chart. If I put only 2 bars in a chart
WriteVal(BarCount);prints 52 when I put the curson on the second and last
bar.I played with it a little but did not find out yet exactly how
BarCount isdefined.Maybe somebody can enlighten me?Thanks,
Ed----- Original Message ----- From: Dave Merrill To:
amibroker@xxxxxxxxxxxxxxx Sent: Saturday, October 25, 2003 10:01
AMSubject: RE: [amibroker] size of an array in AFL?in most
languages, it's possible to find out the size of an array directly,by
examining some property of the array itself or applying some function
toit, without having to know how it was created. some examples
are: array.length
array.size SizeOfArray(array)is that possible in
AFL? if not, it can be worked around since we do ingeneral know how every
array was created, but it's less elegant and lessself
contained.daveI'm not sure how to answer this because it
depends on which array you arerefering too.Are you refering to a
stock data array of some description? If so you coulduse the Barcount
constant which will return the number of bars in the array.Remember it's
zero based so the last bar is refered to as: Barcount -
1Regards,William
Peterswww.amitools.com-----Original Message-----From:
Dave Merrill [mailto:dmerrill@xxxxxxx]sorry for the dumb question,
but what's the syntax for getting the size(number of elements) in an
array? I want to do something like this, onlythat
works: for(i=1; i<=array.length; i++)
{thanks,daveSend BUG REPORTS to
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