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Tomasz,
It is more educative to give pure AFL, when possible.
If the AFL code is long, the user will easily understand reasons to
use for loop as alternative.
One should know to write a 50 lines code and then, if he repeats the
same calculation every 3rd line, then he will be convinced that it is
the time to deal with a more flexible for loop.
But, the most important, is to use for loop when no AFL could solve
the situation.The loop introduction is a great step in AFL structure
and will increase the language power.
Thank you for your endless efforts.
Dimitris Tsokakis
BTW, with your
Change = ROC( Close, -lookback );
you try to ...look into the future ?
If positive, the amibroker future is great !!!
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
wrote:
> Dimitris,
>
> Nice but still for loop is shorter especially when there
> are more ranges to scan.
>
> Once can of course use your ROC() approach to shorten even for loop.
> Whats more for loop makes it possible to parametrize:
>
> startl = Param("Lookback start", 16, 1, 100, 1 );
> endl = Param("Lookback end", 30, 1, 100, 1 );
>
> SumChange = 0;
> for( lookback = startl; lookback <= endl; lookback++ )
> {
> Change = ROC( Close, -lookback );
> SumChange = ( Change > 0 ) - ( Change < 0 );
> }
>
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
>
>
> ----- Original Message -----
> From: "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Monday, April 21, 2003 9:24 PM
> Subject: [amibroker] Re: Is there an easier way?
>
>
> > Eugene,
> > Your variable
> > x16=IIf(C>Ref(C,-16),1,IIf(C==Ref(C,-16),0,-1));
> > is equivalent to the
> > x16A=(ROC(C,16)>0)-(ROC(C,16)<0);
> > Your sum (x16+x17+x18+x19) is equivalent to the
(x16A+x17A+x18A+x19A)
> > and it is
> > S=(ROC(C,16)>0)-(ROC(C,16)<0)+
> > (ROC(C,17)>0)-(ROC(C,17)<0)+
> > (ROC(C,18)>0)-(ROC(C,18)<0)+
> > (ROC(C,19)>0)-(ROC(C,19)<0);
> > If you need it, it is not that complicated !!
> > Note that S is a daily function and you may use it in IB
> >
> > S=(ROC(C,16)>0)-(ROC(C,16)<0)+
> > (ROC(C,17)>0)-(ROC(C,17)<0)+
> > (ROC(C,18)>0)-(ROC(C,18)<0)+
> > (ROC(C,19)>0)-(ROC(C,19)<0);
> > Plot(S,"My sum",4,8);
> >
> > or in AA
> >
> > S=(ROC(C,16)>0)-(ROC(C,16)<0)+
> > (ROC(C,17)>0)-(ROC(C,17)<0)+
> > (ROC(C,18)>0)-(ROC(C,18)<0)+
> > (ROC(C,19)>0)-(ROC(C,19)<0);
> > Filter=S>=3;
> > AddColumn...
> >
> > Dimitris Tsokakis
> >
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
<amibroker@xxxx>
> > wrote:
> > > Hello,
> > >
> > > Using most latest betas (4.31.x or higher) you can use this
code:
> > >
> > > SumChange = 0;
> > > for( lookback = 16; lookback <= 20; lookback++ )
> > > {
> > > Change = Close - Ref( Close, -lookback );
> > >
> > > SumChange = IIF( Change > 0, 1,
> > > IIF( Change < 0, -1, 0 ) );
> > > }
> > >
> > >
> > >
> > > Best regards,
> > > Tomasz Janeczko
> > > amibroker.com
> > > ----- Original Message -----
> > > From: "Eugene" <johngalt1234@xxxx>
> > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > Sent: Monday, April 21, 2003 6:04 PM
> > > Subject: [amibroker] Is there an easier way?
> > >
> > >
> > > > I am working with a mutual fund and am trying the following:
> > > >
> > > > iif(close>ref(c,-16),1,iif(c=ref(c,-16),0,-1))
> > > >
> > > > am comparing the close today to the close 16 days earlier and
> > > > assigning a +1 if it is greater, 0 if it is equal and -1 if
it is
> > lower.
> > > >
> > > > I want to compare todays price with the price 16,17,18,19 and
20
> > days
> > > > earlier. and repeat the same with prices for the preceeding 5
> > days.
> > > > and sum all the values obtained.
> > > >
> > > > Not being a programmer, I see that I have to write a lot of
> > lines. Is
> > > > there a simpler way?
> > > >
> > > > TIA
> > > >
> > > >
> > > >
> > > >
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