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I do not have access to AB now, but I guess this is a way to do it.
for (i = 1; i < BarCount; i++)
{
if (H[i] > H[i - 1])
{
y[i] = H[i];
}
else
{
y[i] = L[i];
}
}
here y[0] is undefined
I guess we are so used to the AB efficient way of array processing
that we forget how to process individual elements now.
Thomas
--- In amibroker@xxxxxxxxxxxxxxx, "dingo" <dingo@xxxx> wrote:
> My bad - I didn't go back and look a Jason's original message
closely
> enough.
>
> d
>
> -----Original Message-----
> From: dingo [mailto:dingo@x...]
> Sent: Wednesday, April 16, 2003 1:42 PM
> To: amibroker@xxxxxxxxxxxxxxx
> Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
>
>
> Didn't you mean it to be:
>
> if (H > Ref(H,-1))
> {X = H;}
> else
> {X = L;}
>
> I didn't try it just noticed the above.
>
> d
>
> -----Original Message-----
> From: bluesinvestor [mailto:investor@x...]
> Sent: Wednesday, April 16, 2003 1:39 PM
> To: amibroker@xxxxxxxxxxxxxxx
> Subject: RE: [amibroker] AmiBroker 4.31.0 BETA Examples
>
>
> 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@x...]
> 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@x...]
> 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@x...]
> 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@x...]
> 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
> <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@x...]
> 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@xxxx
> 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@x...]
> 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@x...]
> 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@x...]
> 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@xxxx>
> 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@x...]
> > 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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