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Hmm ... at first glance I would have thought it would be this:
x = IIf(H > Ref(H,-1), H, L);
if (H > Ref(H,-1))
{y = H;}
else
{y = L;}
Filter=C>0;
AddColumn(H,"H");
AddColumn(L,"L");
AddColumn(x,"X");
AddColumn(y,"Y");
But after running an exploration the results are not the same ... not
sure what is wrong?
Peter
-----Original Message-----
From: Jayson [mailto:jcasavant@xxxxxxxxxxxx]
Sent: Wednesday, April 16, 2003 1:26 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
Anyone,
Ok, a very simple example.....
x=IIf (H >Ref(H,-1),H,L); this would result in a line touching either
the h or low of each bar based on the condition.
if (H >Ref(H,-1))
y = H;
else
y =L;
Plot(y,"HL",colorYellow,1);
Plot(C,"",4,styleCandle);
rather than evaluating the condition on a bar by bar basis this looks to
lastvalue(h) to determine Y for the whole chart. How would I use the
if/else syntax to copy IFF?
Jayson
-----Original Message-----
From: bluesinvestor [mailto:investor@xxxxxxxxxxxxx]
Sent: Wednesday, April 16, 2003 11:00 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
Actually let me clarify something:
condition expression= i<barcount; means do the loop as long as
i< the current barcount (like cum(1))?? YES
this would actually be something like do the loop as long as i<barcount
where barcount = lastvalue(cum(1))
Regards,
Peter
-----Original Message-----
From: bluesinvestor [mailto:investor@xxxxxxxxxxxxx]
Sent: Wednesday, April 16, 2003 10:51 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
Hello Jayson,
myema[ 0 ] = close [0];
Amibroker uses zero based arrays meaning that the first record in an
array is at the 0 position. Basically this just gives a value to the
first myema array. The zero position is the first data record of the
close array.
for ( init-expression ; cond-expression ; loop-expression ) statement
init-expression= i=1; means we start the loop with i=1? YES
condition expression= i<barcount; means do the loop as long as
i< the current barcount (like cum(1))?? YES
loop expression= i++ means i+i+i ?????????? basically this just
means i = i + 1
Hope this helps,
Peter
-----Original Message-----
From: Jayson [mailto:jcasavant@xxxxxxxxxxxx]
Sent: Wednesday, April 16, 2003 10:35 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
"All you really need to know about new features in AFL
I described in:
http://groups.yahoo.com/group/amibroker/message/37591 "
Well, almost all........
Tomasz or any one smarter than me,
Examples certainly help. But I am still a bit lost.... from the post....
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 ];
myema[ 0 ] = close [0];
Do I assume this translates to..... myema today =close today ??
similar to myema=c;??
for ( init-expression ; cond-expression ; loop-expression ) statement
init-expression= i=1; means we start the loop with i=1?
condition expression= i<barcount; means do the loop as long as
i< the current barcount (like cum(1))??
loop expression= i++ means i+i+i ??????????
Could someone please convert the expression to english?
Tia,
Jayson
-----Original Message-----
From: Tomasz Janeczko [mailto:amibroker@xxxxxx]
Sent: Wednesday, April 16, 2003 5:53 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: 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:
http://groups.yahoo.com/group/amibroker/message/37591
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: uenal.mutlu@xxxxxxxxxxx
To: 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! 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
----- Original Message -----
From: Jayson
To: amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, April 16, 2003 6:50 AM
Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
Thank you Steve, I will see if I can locate a copy.
Regards,
Jayson
-----Original Message-----
From: Steve Dugas [mailto:sjdugas@xxxxxxxxx]
Sent: Tuesday, April 15, 2003 11:22 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: 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
----- Original Message -----
From: Jayson
To: amibroker@xxxxxxxxxxxxxxx
Sent: Monday, April 14, 2003 10:01 AM
Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
Thank you Tomasz. I have obviously gone from being fairly high on the
learning curve to Newbie in just one week end :(
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
-----Original Message-----
From: Tomasz Janeczko [mailto:amibroker@xxxxxx]
Sent: Monday, April 14, 2003 3:54 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: 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 Janeczko
amibroker.com
----- Original Message -----
From: Jayson
To: amibroker@xxxxxxxxxxxxxxx
Sent: Monday, April 14, 2003 7:55 AM
Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
Steve,
Your example makes sense yet does not seem to work for me. Else seems to
be ignored . Using the IIF this would simply be ......
a1=iif(c>ref(c,-1),1,0); I am certainly missing something here.... your
input appreciated..
jayson
Jayson
-----Original Message-----
From: Steve Dugas [mailto:sjdugas@xxxxxxxxx]
Sent: Sunday, April 13, 2003 11:25 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: 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 -----
From: Tomasz Janeczko
To: 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
(http://www.amibroker.com/library/detail.php?id=242)
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "Ken Close" <closeks@xxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
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: 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
> amibroker.com
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