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Have you tried it or are just "not sure"? Works
for me and can move to any bar and get the "selectedvalue". If in
doubt use selectedvalue(sum()).
----- Original Message -----
Sent: Tuesday, January 13, 2009 6:01
AM
Subject: [amibroker] Re: Finding the last
true value in an array...
Actually Bill, not sure this works... since the 3rd argument
in
ValueWhen() is required to be a number and not an array.
Could use
LastValue() to turn it into a number, but of course this
only returns the
value from the right hand edge of the chart... so it
wouldn't work
historically... which is what I need.
Any thoughts...?
--- In amibroker@xxxxxxxxxxxxxxx,
"wavemechanic" <timesarrow@xxx> wrote:
>
> How about
this?
>
> x = condition that generates your 1,0 array
> y =
sum(x, range)
> z = valuewhen(x, barindex(), y)
> position in
array = lastvalue(barindex()) - z + 1
>
>
Bill
> ----- Original Message -----
>
From: sidhartha70
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Monday, January 12, 2009 6:33
PM
> Subject: [amibroker] Re: Finding the last true value in
an array...
>
>
> Sorry Barry... my
terminology is confusing...
>
> Lets say I have an
array that has only true or false values in it...
>
>
Lets say the last 10 value of this array are as follows, from
x
> intervals ago until now...
>
>
0,1,0,0,1,0,0,1,0,0
> x.................Now
>
> Now, obviously, BarsSince(array) will return a value of
2... i.e. the
> last true value was 2 intervals ago.
>
> However, the value I'm trying to get is the last value of
true in the
> above x elements of the array... so I want an
_expression_ that returns
> 8 for the above array (i.e. 8
intervals back is the last value of
> true). Any
ideas...?
>
> Hopefully that's clearer now.
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Barry
Scarborough" <razzbarry@>
> wrote:
>
>
> > What are your trying to do? HHV gives the value
of the highest high
> > over the period you enter in x.
If you want to find how far back
that
> > is you can
use
> >
> > bs = BarsSince(H ==
HHV(H, 10));
> > // the next line prints the num bars
back and the high of that bar
> > printf(NumToStr(bs,
1.0) + " High " + NumToStr(HHV(H, 10), 1.2));
> >
> > If you want to find the value of the other things bs
bars ago then
> > you can
> > //
use the following. This applies to any array
> >
lastHigh = ref(High, - bs);
> > // this is another way to
see the results that shows the high value
> >
Plot(lastHigh, "high bars ago", colorBlack);
> >
Plot(Ref(C, -bs), "close bars ago", colorblue);
> >
Plot(Ref(MA(C, 10), -bs), "MA(10) value bars ago",
colorGreen);
> > // then look at what valuewhen
returns
> > Plot(ValueWhen(H == HHV(H, 10), H, -1),
"ValueWhen", colorRed);
> >
> >
bsolutely the last thing you want to do is start using loops,
such as
> > for loops, to extract data from ABs arrays. Your
code will be much
> > cleaner and faster if you use
straight AFL.
> >
> > Your
terminology true value is confusing. The value in an array is
> > the true value. Do you mean what was the value when
the
condition was
> > true?
> >
> > Barry
> >
>
>
> >
> > --- In amibroker@xxxxxxxxxxxxxxx,
"sidhartha70" <sidhartha70@>
> >
wrote:
> > >
> > >
Graham,
> > >
> > > I'm
trying to get my head around that code right now... but
first
> > > thing I noticed was that my post was
poorly worded. Let me
reword it
> > > below, and
maybe you can tell me if this is what you thought I
> >
meant....
> > >
> > > Ok.
It's easy to find the first occurrence of a true value of
an
> > > array... that is looking from now backwards x
intervals. simply
> > > HHV(array,x) where x=no of
intervals back.
> > >
> > >
However, how can I find the last true value of the array looking
> > back
> > > over x
intervals...?? i.e. the first true value starting from
x
and
> > > looking forward to now.
>
> >
> > > is there an array method without
looping...?
> > >
> > > Many
Thanks
> > >
> > >
> > > --- In amibroker@xxxxxxxxxxxxxxx, Graham
<kavemanperth@> wrote:
> > >
>
> > > > try this
> > >
> array = h;
> > > > LastHHVValue = valuewhen(
hhvbars(array,x)==0, array );
> > > >
> > > > --
> > > >
Cheers
> > > > Graham Kav
> >
> > AFL Writing Service
> > > > http://www.aflwriting.com
>
> > >
> > > >
> >
> >
> > > > 2009/1/13 sidhartha70
<sidhartha70@>:
> > > > > Hi
All,
> > > > >
> > >
> > Ok. It's easy to find the last true value of an
array...
simply
> > > > > HHV(array,x) where
x=no of intervals back.
> > > >
>
> > > > > However, how can I find the last
true value of the array
> > looking
back
> > > > > over x
intervals...??
> > > > >
>
> > > > is there an array method without
looping...?
> > > > >
> >
> > > Many Thanks
> > > >
>
> > > > >
> > >
>
> > >
> >
>
>
>
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