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In keeping with the spirit of this thread then....care to explain this
one for me (and I suspect, other newbies):
" REF(c>ref(c,2),5); says that the close that happened five days
ago has to be higher than the close that happened on the sixth day ago. "
My current level of understanding says that this part:
c>ref(c,2)
Will return a 0 or 1. For e.g., if the current close is greater than
the close of 2 bars ago, this statement is true and therefore "1".
So the longer expression now becomes:
REF(1,5);
Which does not make sense.
I've read the User's Guide. But obviously missed something on how to
nest a boolean test within the ref function, and have it all make sense.
--- In amibroker@xxxxxxxxxxxxxxx, <professor@xxx> wrote:
>
> Ron,
>
> The examples that you used were perfect. Even I could understand how
they worked and learn how to do things that I wanted to do but didn't
know how to do it. I spent a lot of time using barssince and ref
trying accomplish this.
>
> Thanks,
> Tom
> ----- Original Message -----
> From: Ronald Davis
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Thursday, August 28, 2008 11:36 AM
> Subject: Re: [amibroker] Re: The best way to help newbies, oldies,
... and AmiBroker ...
>
>
> In the very early days of my Amibroker learning curve, The best
help that I
> received was from this board when an experienced user was kind
enough to
> quickly code an example or what I was asking.
>
> Then, I would play with what they had given me, and I started to
understand
> how to use Amibroker.
>
> For example, REF(c>ref(c,2),5); says that the close that happened
five days
> ago has to be higher than the close that happened on the sixth day
ago.
>
> Whereas, SUM(c>ref(c,2),5); only requires that any one or more of the
> closes over the last five days has to be higher than the previous
days
> close.
>
> The above examples of simple english explanations from this board
are how I
> started learning Amibroker. Ron D
>
> ----- Original Message -----
> From: "Ken Close" <ken45140@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Thursday, August 28, 2008 12:15 PM
> Subject: RE: [amibroker] Re: The best way to help newbies, oldies,
... and
> AmiBroker ...
>
> > Amen. Amen! AMEN!
> >
> > While Tomasz has done so much to improve and expand the
training/manual
> > since the early days (he really has!), the fact there is continual
> > questions
> > on the same stuff or "small stuff", suggests there is still room
for and
> > benefit from improvement.
> >
> > I am constantly reminded (or remind myself) that Tomasz has to
say "Read
> > the
> > Manual". Some questions are almost obvious that a quick trip to
help
> > would
> > answer the question, but other "simple" questions are not. Many
of us do
> > attempt to find the answers in help but cannot.
> >
> > For example, yesterday, I wanted to know how to make subscripted
arrays.
> > I
> > did not remember that VarGet and VarSet was set up to do this.
So a trip
> > to
> > Help and typing in "subscripted arrays" found 9 entries none of
which led
> > me
> > to VarSet or VarGet. I think one of the improvements would be a
search
> > system which allowed more complex search logic or strings, or
some way to
> > zero in on the specific request. As Tomasz says, it is almost
always in
> > there, it just is hard to find.
> >
> > Ken
> >
> >
> >
> > -----Original Message-----
> > From: amibroker@xxxxxxxxxxxxxxx
[mailto:amibroker@xxxxxxxxxxxxxxx] On
> > Behalf
> > Of Dennis Brown
> > Sent: Thursday, August 28, 2008 11:58 AM
> > To: amibroker@xxxxxxxxxxxxxxx
> > Subject: Re: [amibroker] Re: The best way to help newbies,
oldies, ... and
> > AmiBroker ...
> >
> > Brian,
> >
> > You are correct. I switched to AB because I wanted a programming
language
> > that was fundamentally tied into the realtime price arrays and the
> > charting
> > for the same. RT quotes --> Database --> AFL -->
> > Charts. That was all I wanted, and that is pretty much all I use.
> > There is a lot of overhead associated with getting and
maintaining the
> > data,
> > interacting with the user, and outputting the the data in a
useful form.
> > I
> > only wanted to be concerned with the algorithms that decided to
buy or
> > sell.
> > Interestingly, even with all the support functions handled by
AB, I still
> > spend 80% of my time coding UI things! I think it is some kind of
> > computer
> > programming law.
> >
> > AFL was my real destination with AmiBroker, and I had a hard
time because
> > it
> > was not well defined. A lot of assumptions were made about prior
> > knowledge
> > of specific programming language conventions in C like languages.
> > Languages
> > I had no experience with. These are middle level languages. My
> > experience
> > was with machine level assembler code, and very high level like
> > Revolution/SuperCard/HyperCard, and a
> > smattering of BASIC and APL from the original versions 40 years ago.
> > I had no idea that I was supposed to go learn C syntax before I
could use
> > the AFL documentation. IMHO this is a documentation hole big
enough to
> > drive a truck through.
> >
> > Then what happens when someone has no experience with any
programming
> > language at all. Perhaps some Excel experience, or maybe
experience using
> > a
> > programmable calculator. I can't imagine the bewilderment with
AFL. It
> > takes a lot of handholding from support or this list to get over
the first
> > hump.
> >
> > I believe it would be appropriate to define the AFL language in the
> > documentation as if it were the only language that exists on the
planet.
> >
> > For instance "+" is defined as "Addition". Whereas, in reality
the "+"
> > operator is data type dependent. It will add two numbers, add a
number to
> > every element in an array, add two arrays element by element, or
> > concatenate
> > two strings. It will not add a number or array to a string.
> >
> > As I have suggested before, I would have liked to see a "Complete"
> > listing of all operators, functions, reserved words, syntax
characters,
> > directives, etc., in one live list index that points to a page that
> > explains
> > each one in the same way that the functions are now described. Then
> > additional "see also" pointers on those pages to point to more
in depth
> > documents when available. In fact the current functions list
could simply
> > be expanded to do this.
> >
> > This would have saved me many weeks off the learning curve.
> >
> > I don't know if Howard is planning on doing this in his new
book, but it
> > should be part of the on-line documentation.
> >
> > Best regards,
> > Dennis
> >
> >
> > On Aug 28, 2008, at 10:34 AM, brian_z111 wrote:
> >
> >> I didn't explain myself very well there.
> >>
> >> What I am saying is that I think we are making it harder by not
> >> admitting that it is a programmers program and just getting on with
> >> teaching AFL.
> >>
> >> If anyone held told me that at the start I would have run for
it but
> >> the fact is that the help manual is about 'AmiBroker the
program' but
> >> eventually I came to realise it is all about programming -
> >> specifically AFL.
> >>
> >> So, if I do want to get on with it where do I go?
> >>
> >> The AFL section of the help manual is condensed.
> >> The first few chapters of Howards Book are a basic intro to AB
and the
> >> rest of the book is orientated around SystemDesign & Evaluation?
> >>
> >> Where is the next stop on the AFL line?
> >>
> >>
> >> brian_z
> >>
> >>
> >>
> >>
> >> --- In amibroker@xxxxxxxxxxxxxxx, "brian_z111" <brian_z111@> wrote:
> >>>
> >>> Herman,
> >>>
> >>>> I always figured that sticking with AFL would have provided a
more
> >>>> continuous path for users to develop their programming expertise.
> >>>
> >>> This is a new point, not really discussed much before, I think.
> >>>
> >>> I really don't know how to put it in words but you are so right.
> >>>
> >>> Tomasz should be proud of me because if I am a programmer at all I
> >> am
> >>> an array programmer...... but sometimes I am left reaching for
AFL?
> >>>
> >>> Perhaps there are conventions that people with 2 or more
> >> programming
> >>> languages automatically understand?
> >>>
> >>> Do I have to go and learn C++ as well.
> >>>
> >>> Should I need too?
> >>>
> >>> brian_z
> >>>
> >>
> >>
> >>
> >> ------------------------------------
> >>
> >> Please note that this group is for discussion between users only.
> >>
> >> To get support from AmiBroker please send an e-mail directly to
> >> SUPPORT {at} amibroker.com
> >>
> >> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >> http://www.amibroker.com/devlog/
> >>
> >> For other support material please check also:
> >> http://www.amibroker.com/support.html
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >
> >
> > ------------------------------------
> >
> > Please note that this group is for discussion between users only.
> >
> > To get support from AmiBroker please send an e-mail directly to
SUPPORT
> > {at}
> > amibroker.com
> >
> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > http://www.amibroker.com/devlog/
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> > Yahoo! Groups Links
> >
> >
> >
> >
> > ------------------------------------
> >
> > Please note that this group is for discussion between users only.
> >
> > To get support from AmiBroker please send an e-mail directly to
> > SUPPORT {at} amibroker.com
> >
> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > http://www.amibroker.com/devlog/
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> > Yahoo! Groups Links
> >
> >
> >
>
------------------------------------
Please note that this group is for discussion between users only.
To get support from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
For other support material please check also:
http://www.amibroker.com/support.html
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