|
Don't have time now to think about it and it
would be easier if you posted the code instead of working with a moving
target. However, off the top of my head you might be able to avoid
looping by using brute force. For example, if the range is 5 bars then you
could test the 5th bar back with iif(barssince(x) == 5, and if that is
negative then do the same for the 4th bar back, etc.
----- Original Message -----
Sent: Tuesday, January 13, 2009 8:04
AM
Subject: [amibroker] Re: Finding the last
true value in an array...
SelectedValue() works Bill... Thanks.
However, the
problem I'm having is that I'm using this in AFL code and
I want it to
complete the historical array if you like, not just off a
SelectedValue()
but with each value of Sum(x,range) as ir changes...
which it's looking
like is not possible.
Horribly I might have to use a loop.
Errrgg.
--- In amibroker@xxxxxxxxxxxxxxx,
"sidhartha70" <sidhartha70@xxx> wrote:
>
> Nope, I've tried
it Bill...
>
> I get an Error 5, Argument #3 has incorrect type
on the ValuneWhen()
> line...
>
>
>
> --- In
amibroker@xxxxxxxxxxxxxxx,
"wavemechanic" <timesarrow@> wrote:
> >
> > 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 -----
> > From: sidhartha70
> > To: amibroker@xxxxxxxxxxxxxxx
>
> 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@>
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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