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<SPAN
class=355190618-25102003>actually, the more I thought about it, the more I saw
problems. first off, wouldn't a value of -1 return false for IsTrue()?. second,
I wasn't thinking only of price etc arrays, but arrays in general, ones I might
use for anything (top N tickers and their RSI/Stoch/SomeStat values, whatever).
beyond the idea that arrays may contain empty values, I wanted to
find the size beyond which no element exists at all.
<SPAN
class=355190618-25102003>
<SPAN
class=355190618-25102003>as far as I know and am hearing, since I'm managing the
contents of the array in the first place, the best way to do that is to keep
track of their size externally. I'd prefer to write functions that operate on
any passed array, looping through it or whatever, and don't need to be told how
big it is by the code that created it. but that's a matter of style, not
capability. I can cope.
<SPAN
class=355190618-25102003>
<SPAN
class=355190618-25102003>if there is some AFL alternative, I'd love to hear it,
but it's no big deal.
<SPAN
class=355190618-25102003>
<SPAN
class=355190618-25102003>dave
<BLOCKQUOTE
>You
should decide if you consider the {empty} part into the "size" of an
arrayor not.StochD(50) is not defined [it is empty] for many bars in the
beginning. Does the empty part belongs to the size of the array ?The
answer is not that simple and may lead to confusion.The
array=log((cum(1)-300)*(cum(1)-500)) is not defined [empty] from the
300th to the 500th bar. What is the size of this array ?A quantity
should exist first and then speak for its size.Do not confuse the
existence of an array with the way amibroker plots the array. Amibroker
"knows" the data lenght of a symbol and plots all functions according to
this "size". If IBM has 900 data in your database and you select IBM
from your symbol tree, then all the arrays would have size=900. If, in the
same database INTC has 899 data, then the same arrays will have a new
"size"=899. This would lead to contradiction about the real size of an
MA(C,10) array.Dimitris Tsokakis--- In amibroker@xxxxxxxxxxxxxxx,
"Dave Merrill" <dmerrill@xxxx> wrote:> thanks dimitris, I
like it. simple and direct.> > dave>
Dave,> for an array X the size is
Cum(IsTrue(X))> I suppose here you are not interested
for the {empty} bars.> If you need to include the empty
bars also, then the size is simply >
Cum(1).> [Both above are 1-basis
counting]> Dimitris Tsokakis> --- In
amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx>
> wrote:> > 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 to>
> it, 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 in> >
general know how every array was created, but it's less elegant and
> less> > self
contained.> > > >
dave> > > > I'm not
sure how to answer this because it depends on which array
> you are> > refering
too.> > > > Are you
refering to a stock data array of some description? If so
> you> > could use 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 -> >
1> > > >
Regards,> > William
Peters> > www.amitools.comSend
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