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Marek, Dimitris, and all:
Got into this topic on other boards, including
discussions with Yahoo. Copyright infringement depends on the purpose
of this board. There is an exclusion in copyright law known as Fair
Use. If it falls under the Fair Use practice section of copyright law,
which requires that it is for specified purposes, including research and
education, then copyright material and direct links can be used without
permission, as long as authorship is acknowledged.
The bottom line is to establish whether use of the
material is for personal nonprofit research and education purposes that do not
adversely affect commercial interests. Article 10 of Yahoo's Terms of
Agreement place all Yahoo boards under the r&e banner. If one is
concerned, you can include the phrase "For Fair Use," and some boards
automatically include a Fair Use disclaimer.
Bill
----- Original Message -----
<BLOCKQUOTE
>
<DIV
>From:
DIMITRIS
TSOKAKIS
To: <A title=amibroker@xxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Friday, November 16, 2001 3:57
AM
Subject: [amibroker] Re: Trendline
detector in trading system
Marek,Just a personal hint.Articles of TASC or any
other source are usually covered by a copyright. It is better to giveonly
the reference and not to reprint the article or any part of
it.Dimitris tsokakis --- In <A
href="">amibroker@xxxx..., "Marek Chlopek" <<A
href="">mchlopek@xxxx...> wrote:> Hi all,>
We have an unique function "STUDY" in Amibroker that gives us possibility
to> refer from AFL code to line (often plotted as a trendline or
vertical for> stop loss) that has been manually drawn by the
user.> > I was wondering if there is a ready-to-use formulathat
automatically> detects trendlines? This could be useful for trading
system with entry> and/or exit strategy that involves barrier
stops.> Regards> Marek Chlopek> > NB:>
> Please find enclosed additional description from the article
published in> S&C.> The C++ code is also available
(excluding some header files with variables> structure
definitions).> > ----------------> Stocks &
Commodities V16:7 (324-328): Barrier Stops And Trendlines by J.>
Katz, Ph.D., and D. McCormick> Copyright (c) Technical Analysis
Inc.> > TRENDLINE DETECTOR> The algorithm that detects
the trendlines, and that is accessed via calls to> the functions
"UpTL" and "DownTL"> (see sidebar "C++ code"), operates as follows. Let
us consider trendlines> generated by UpTL - trendlines
sloping> upward and that exist below the price. A search is made to
determine all> lines with the following properties: First,>
the line must connect two price points within the lookback period,
and> second, other than these two points, no other> points
must either touch or penetrate beyond the line, and third, the
line> must fall between yl and yh (y-axis) at bar cb> (current
bar, x-axis).> > A count is made of all lines satisfying these
three requirements. This count> is the return value from the
function. The function also returns the median> of the lines if
there is more than one, or the line itself, if there is only> a
single one, via a trendline class variable. If no lines are found
that> meet all the requirements, a count of zero is returned; in
such cases, the> trendline returned should be ignored, as it will
contain garbage. The> function "DownTL" works in exactly the same
way, except that it finds lines> that are above the price rather
than below it.> > The functions "FindUpslopeTrend" and
"FindDownslope Trend" step through> ranges moving away from the
price until one of the previously mentioned> functions returnsa
count greater than one, indicating the presence of at> least one
valid trendline lying within the specified range.> > These
functions also impose additional criteria; not just any trendline
will> do. We require that the two price points determining the line
have a> separation of greater than five bars and that the most recent
of these two> points exists at> least one bar prior to the
current bar. If all of these conditions are met,> we have found a
valid trendline. The way these> functions are set up, they will attempt
to find the closest trendlines that> are not more than $4,000 away
from the current price using the old S&P 500> contract. Weuse
the old S&P 500 contract, since most of our historical data>
consists of this contract.------------------------ Yahoo! Groups
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