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[amibroker] Re: Sequence of two conditions



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  Hi markus.

  Do you want cond B to only be true today, if yesterdays cond A is 
no longer true.

  cond a is close > a 20 day MA.
  cond b is close <50 day MA today, only if yesterdays cond A was 
still true, but todays cond A is not true.
 
 
  Place and observe this in the indi builder. Is this what you mean.
Aa=C>MA(C,20);
bb=C<MA(C,50);
cond1=aa;
cond2=bb AND BarsSince(Aa==1)==1;

Plot(ValueWhen(Cond2,C,1),"",6,4);
Plot(C,"",1,64);
Plot(MA(C,25),"",7,4);
Plot(MA(C,20),"",1,4);  



  Peter.

--- In amibroker@xxxxxxxxxxxxxxx, "IVA GmbH" <funnybiz@xxxx> wrote:
> Dimitris,
> 
> actually itīs not. Exrem and Valuewhen judge the occurence from the 
back
> ofthe chart while I try to find the first occurrence of a condition 
right
> after another condition has taken place.
> 
> Example: I want to detect the first instance of b right after a has
> happened:
> a  a  a  b  b  b
> 
> Using Valuewhen I would have to use Valuewhen(..,..,3). But I donīt 
know in
> advance how many occurrences of b take place. So I thought the only 
way to
> address this b is to find the first right AFTER the occurrence of a.
> 
> Do you know what I mean???
> 
> Thanks
> 
> Markus
> ----- Original Message -----
> From: "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Monday, March 24, 2003 9:05 PM
> Subject: [amibroker] Re: Sequence of two conditions
> 
> 
> For
> cond1=a;
> cond2=b;
> you may have a sequence
> a, a, b, b, b, a
> with
> cond11=exrem(cond1,cond2);
> cond22=exrem(cond2,cond1);
> you will have
> a,    b,     , a
> ie only the forst occurrence of each a or b.
> Is this what you are looking for ?
> DT
> --- In amibroker@xxxxxxxxxxxxxxx, "IVA GmbH" <funnybiz@xxxx> wrote:
> > Folks,
> >
> > maybe you have a solution for the following:
> >
> > Iīd like to detect the first occurence of cond2 after cond1 has
> happened.
> >
> > I seemingly canīt use Valuewhen function since it calculates from
> the last bar, not from cond1 (i.e. I nedd a calculation forward
> rather than backward).
> >
> > So, in case that there are several instances of cond2 after cond1,
> I might get a wrong result.
> >
> > Could anyone help me, please?
> >
> > Thanks a lot
> >
> > Markus
> 
> 
> 
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