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<FONT
size=2>"All you really need to know about new features in AFL
I described in:
<FONT
size=2>http://groups.yahoo.com/group/amibroker/message/37591<FONT
face=Arial size=2> "
<SPAN
class=920470514-16042003>
<SPAN
class=920470514-16042003>
Well, almost
all........
<SPAN
class=920470514-16042003>
Tomasz
or any one smarter than me,
<SPAN
class=920470514-16042003>
<SPAN
class=920470514-16042003>Examples certainly help. But I am still a bit lost....
from the post....
<SPAN
class=920470514-16042003>
This example illustrates
the for statement: <FONT
color=#ff0000 face=Arial size=2>
myema[ 0 ] = Close[ 0
];
for( i = 1; i < BarCount;
i++ ){ myema[ i ] = 0.1 * Close[ i ] + 0.9 * myema[ i - 1
];
<SPAN
class=920470514-16042003>myema[ 0 ] = close [0];
<SPAN
class=920470514-16042003>
<SPAN
class=920470514-16042003>Do I assume this translates
to..... myema today =close today ?? similar to
myema=c;??
<SPAN
class=920470514-16042003>
for (
init-expression ; cond-expression ;
loop-expression ) statement
<SPAN
class=920470514-16042003>init-expression=
i=1; means we
start the loop with i=1?
<SPAN
class=920470514-16042003>condition expression=
i<barcount;
means do the loop as long as i< the current barcount (like
cum(1))??
<SPAN
class=920470514-16042003>loop expression= i++
means i+i+i ??????????
<SPAN
class=920470514-16042003>Could someone please convert the expression to
english?
<SPAN
class=920470514-16042003>
<SPAN
class=920470514-16042003>Tia,
<SPAN
class=920470514-16042003>
Jayson
<FONT face=Tahoma
size=2>-----Original Message-----From: Tomasz Janeczko
[mailto:amibroker@xxxxxx]Sent: Wednesday, April 16, 2003 5:53
AMTo: amibroker@xxxxxxxxxxxxxxxSubject: Re: [amibroker]
AmiBroker 4.31.0 BETA Examples
Hello,
I fully agree. for/while/if-else + array access is
covered
on 3 or 4 pages of any C/C++ book
So this is actually less than 1% of entire C/C++
book.
So there is absolutely no need to buy/read C++
book
All you really need to know about new features in
AFL
I described in:
<A
href="">http://groups.yahoo.com/group/amibroker/message/37591
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
<A href=""
title=uenal.mutlu@xxxxxxxxxxx>uenal.mutlu@xxxxxxxxxxx
To: <A
href=""
title=amibroker@xxxxxxxxxxxxxxx>amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, April 16, 2003 10:39
AM
Subject: Re: [amibroker] AmiBroker 4.31.0
BETA Examples
Hi Steve,
C++ is definitely not required to program in
AFL;
it would be an overkill! <FONT
face=Arial>C++ covers maybe 10 times
more stuff than AFL.
The new stuff in AFL is easily learnt within 2
hours.
Simply ask the people here.
UM
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
<A href=""
title=jcasavant@xxxxxxxxxxxx>Jayson
To: <A
href=""
title=amibroker@xxxxxxxxxxxxxxx>amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, April 16, 2003 6:50
AM
Subject: RE: [amibroker] AmiBroker
4.31.0 BETA Examples
<SPAN
class=082024904-16042003>Thank you Steve, I will see if I can locate a
copy.
<SPAN
class=082024904-16042003>
<SPAN
class=082024904-16042003>Regards,
<FONT color=#0000ff face=Arial
size=2>Jayson
<FONT face=Tahoma
size=2>-----Original Message-----From: Steve Dugas
[mailto:sjdugas@xxxxxxxxx]Sent: Tuesday, April 15, 2003 11:22
PMTo: <A
href="">amibroker@xxxxxxxxxxxxxxxSubject:
Re: [amibroker] AmiBroker 4.31.0 BETA Examples
Hi Jayson,
Sorry to offer the help and then not be around to follow
through on it. But, Monday seems to roll around almost every week these
days, and then its off to work again. Better for you though - TJ filled
in for me : - )
I'm not sure what kind of book you would like, but since
TJ seems to follow C++ syntax, I can recommend a C++ book that I found to be
very good (pretty big though - over 1000 pages). It is very thorough and
easy to understand - definitely geared for beginners in my opinion. It is
"C++ Primer Plus" by Stephen Prata. I think you could probably just read up
on the items you are interested in if you aren't interested in learning the
whole language. Be careful because it seems that there are a couple of
other C++ books that call themselves "primers", but are definitely
NOT for beginners. Especially stay away from Stanley Lippman's book, at
least until you have some experience (take it from
me....please!).
Steve
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
<A href=""
title=jcasavant@xxxxxxxxxxxx>Jayson
To: <A
href=""
title=amibroker@xxxxxxxxxxxxxxx>amibroker@xxxxxxxxxxxxxxx
Sent: Monday, April 14, 2003 10:01
AM
Subject: RE: [amibroker] AmiBroker
4.31.0 BETA Examples
<SPAN
class=732395813-14042003>Thank you Tomasz. I have obviously gone from
being fairly high on the learning curve to Newbie in just one week end
:(
<SPAN
class=732395813-14042003>
<SPAN
class=732395813-14042003>Could you recommend a beginner level book that
may help some of us get up to speed with this new upgrade? I might as well
be reading Japanese , but I don't want to start THAT thread again
:))
Jayson
<FONT face=Tahoma
size=2>-----Original Message-----From: Tomasz Janeczko
[mailto:amibroker@xxxxxx]Sent: Monday, April 14, 2003 3:54
AMTo: amibroker@xxxxxxxxxxxxxxxSubject: Re:
[amibroker] AmiBroker 4.31.0 BETA Examples
Hello,
While IIF works on ARRAY,
if/else works on INDIVIDUAL number/boolean (element of
the array).
Therefore you should write either
a1 = IIF( C > Ref( C, -1 ), 1, 0 );
(or even: a1 = C > Ref( C, -1 );
or iterate:
for( i = 1; i < BarCount; i++ )
{
if ( Close[ i ] > Close[ i - 1 ]
)
a1[ i ] =
1;
else
a1[ i ] =
0;
}
It is important to understand that IIF is a FUNCTION
that works on arrays,
while if/else is control flow STATEMENT.
Function just evaluates all arguments and returns
value(s)
Control flow statement changes program
flow.
This is fundamental difference.
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
<A href=""
title=jcasavant@xxxxxxxxxxxx>Jayson
To: <A
href=""
title=amibroker@xxxxxxxxxxxxxxx>amibroker@xxxxxxxxxxxxxxx
Sent: Monday, April 14, 2003 7:55
AM
Subject: RE: [amibroker] AmiBroker
4.31.0 BETA Examples
<SPAN
class=934273705-14042003>Steve,
<SPAN
class=934273705-14042003>Your example makes sense yet does not seem to
work for me. Else seems to be ignored . Using the IIF this would simply
be ......
<SPAN
class=934273705-14042003>a1=iif(c>ref(c,-1),1,0); I am
certainly missing something here.... your input
appreciated..
<SPAN
class=934273705-14042003>jayson
<SPAN
class=934273705-14042003>
<SPAN
class=934273705-14042003><FONT color=#0000ff face=Arial
size=2><IMG align=baseline alt=""
border=0 hspace=0 src="gif00217.gif">
<SPAN
class=934273705-14042003>
Jayson
<FONT face=Tahoma
size=2>-----Original Message-----From: Steve Dugas
[mailto:sjdugas@xxxxxxxxx]Sent: Sunday, April 13, 2003 11:25
AMTo: amibroker@xxxxxxxxxxxxxxxSubject: Re:
[amibroker] AmiBroker 4.31.0 BETA Examples
Hi Ken,
I think the concept of loops and if-then-else is the
same in all languages. I imagine you could read up on
it at many websites (e.g. - MSDN scripting site). Once you grasp
the concept, it is just a matter of using AFL syntax. You would probably
use it mostly for iterating your arrays if you wanted to do that. Here
is a simple pseudo-code - try coding it in AFL:
For (SecondBar to LastBar)
If (Today's Close > Yesterday's
Close)
MyArray = 1
Else
MyArray = 0
Plot MyArray
Of course, please feel free to ask for
help!
Steve
----- Original Message -----
<BLOCKQUOTE
>
<DIV
>From:
Tomasz
Janeczko
To: <A
href=""
title=amibroker@xxxxxxxxxxxxxxx>amibroker@xxxxxxxxxxxxxxx
Sent: Sunday, April 13, 2003
10:39 AM
Subject: Re: [amibroker]
AmiBroker 4.31.0 BETA Examples
Ken,
Very nice story :-)
As per your request, attached is a Parabolic SAR
formula
that I have rewritten from JScript
version
(<A
href=""><FONT
size=2>http://www.amibroker.com/library/detail.php?id=242<FONT
size=2>)
Best regards,Tomasz
Janeczkoamibroker.com
----- Original Message -----
From: "Ken Close" <<A
href=""><FONT
size=2>closeks@xxxxxxxx>
To: <<A
href=""><FONT
size=2>amibroker@xxxxxxxxxxxxxxx<FONT
size=2>>
Sent: Sunday, April 13, 2003 4:05 PM
Subject: RE: [amibroker] AmiBroker 4.31.0 BETA
Examples
> Tomasz:>
> As always, you have good sound advice.
However......> > You say, "Here is a fast sports car,
very versatile and powerful. It> has 7 forward gears, but
if you are a beginner, do not worry....always> stay in maximum
of 4th gear. Plenty of nice driving is possible in 4th>
gear. Wait until you become more experienced before you
try gears 5,> 6, and 7."> > I say, "Thank you for
providing such a nimble sports car, but I am in a> race, and I
do not think I can finish even 10th in this race, until I> get
out past 4th gear. If you or others would just provide some
more> examples of how to use 5th and 6th gear, then I could
more confidently> try them. Maybe even copy your use of them.
Then, probably, I will have> enough experience to try 7th gear
on my own."> > More examples is all I am asking
for....my objective is not to stay in> 4th gear.>
> Thanks,> > Ken> > -----Original
Message-----> From: Tomasz Janeczko [mailto:amibroker@xxxxxx]
> Sent: Sunday, April 13, 2003 9:47 AM> To: <A
href=""><FONT
size=2>amibroker@xxxxxxxxxxxxxxx>
Subject: Re: [amibroker] AmiBroker 4.31.0 BETA Examples>
> Ken,> > > First, additional kudos to Tomasz
for another step-jump in capability> of> >
Amibroker.> Thank you.> > > Second, a caution,
in marketing terms, of having capability that is so> > hard
to apply for "non-programmers", beginners, and non-technical>
types> > that the extra capability is viewed not as an
advantage or benefit,> but> > just the
opposite.> > The beginners don't really need to jump
into deep water right from> the start as AFL still supports
"old-way" of work.> > When you write> >
TypicalPrice = (H+L+C) /3;> > it still operates on H, L,
C arrays and produces array so no> looping is needed.>
> New features are added as 'extra' stuff and do not>
change the way old statements work.> > > I apologize
- but may speak for many hidden lurkers - that I have just>
> mastered the idea that "every AFL statement only executes once",
but> now> > I must scramble to reorient my brain for
repeated iterations thru AFL> > statements.> >
See above - you don't need really to write loops if you don't want
them.> All previously written code will execute the same way as
before.> > Unless you use a while and/or for loop
nothing has really changed.> > So, you don't really need
to "re-orient your brain" :-)> > You can view new
features as a replacement of JScript/VBScript.> You may use
these new features only when you needed to use> scripting in
previous versions.> > Best regards,> Tomasz
Janeczko>
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