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Look at
R1b = ValueWhen(IsNull(LineR1) AND ...
You should expect a Null value for R1b.
I think you search for the last available R1b value...
If positive, then
R1b = ValueWhen(IsNull(LineR1) AND IsTrue(Ref(LineR1,-1)), Ref
(LineR1,-1) );
would do the job, without changing anything else.
Note also that R1b and R1delta will be effective AFTER the last R1
point.
Dimitris
--- In amibroker@xxxxxxxxxxxxxxx, "see_change007" <cvt@xxxx> wrote:
> Thanks to graham I have the following code to help reference what I
> want
>
> At this stage I have put the retracement lines on a Custom
indicator
> which is the second in the list of custom indicators of my custom
> list. I'm assuming that according to the naming protocol , this
> should be on chart referenced 0001
>
> LineR1 = Study("R1",0001);
> R1a = ValueWhen( IsTrue(LineR1) AND IsNull(Ref(LineR1,-1)),
LineR1 );
> R1b = ValueWhen(IsNull(LineR1) AND IsTrue(Ref(LineR1,-1)), LineR1 );
> R1delta = (R1a-R1b)/R1a;
> AddColumn(R1a,"R1Start",1.2);
> AddColumn(R1b,"R1finish",1.2);
> AddColumn(R1delta,"R1%",1.2);
>
> The above logic makes sense but at the moment when I run this in
> explore mode I don't get any results showing in the columns
>
> Assuming I"ve labled the retracements correctly , and i'm serching
> the correct list of shares in the correct time frame are there any
> other obvious errors ?
>
>
> See change
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "see_change007" <cvt@xxxx> wrote:
> > Hi
> >
> > I'm working on a long term trading system and I'm currently
> looking
> > at ways to exclude shares that have shown a tendancy to drop
> > significant amounts.
> >
> > I want to define retracments manually , label them eg R1 , and
> then
> > reference features of the retracement using the study feature
> >
> > The features I want to reference are the percentage decrease and
> the
> > time before the buy signal that the retracement occured
> >
> > I've got a grasp of the basics of amibroker , but this is outside
> my
> > area of "expertise"
> >
> > Any suggestions how I might do this ?
> >
> > See Change
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