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Hi Mike
I wasn't aware of IsNan so I've learned something.
A test of xaInLongTrade using IsNan didn't indicate any dodgy data.
The following 3 lines of code generated compressed data when there
were only Null values on the screen - but as soon as there are any
non-Null values to be plotted, the price data looks fine. However,
where the data is compressed (according to the status bar), the Y
axis is not 0 but is approx 0.2, irrespective of the security.
xaInLongTrade = Flip(Buy, Sell);
xaPlotValue = IIf(xaPlotValue <= 0, Null, xaPlotValue);
Plot(IIf(xaInLongTrade == True, xaPlotValue, Null), "test",
colorGreen, styleThick);
In the second line I've even substituted <= 0 with <= <value near
price action> and no change in result.
Surely this has to be a coding error, but I am getting absolutely
nowhere.
Graham
--- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@xxx> wrote:
>
> Hi,
>
> Is it possible that your calculation for xaInLongTrade is returning
a
> NaN value (i.e. divide by zero)?
>
> In such cases, your IIF would evaluate to true (i.e. NaN is non
zero)
> and you would be getting the value of xaPlotValue instead of the
> expected NULL.
>
> Mike
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Graham Johnson" <grahamj@>
> wrote:
> >
> > Hi Tomasz
> >
> > That works fine.
> >
> > So, I am really baffled as to why there is a problem with my code
> > that includes Iif.
> >
> > Maybe I need to try an alternative approach - if I can think of
one.
> >
> > Graham
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@>
> > wrote:
> > >
> > > Hello,
> > >
> > > I don't know the rest of the code you are using, but this:
> > > Plot(IIf(MA(C,10)>C, C, Null), "label", colorGreen,
styleThick);
> > >
> > > works just fine and zero is not included.
> > >
> > > Best regards,
> > > Tomasz Janeczko
> > > amibroker.com
> > > ----- Original Message -----
> > > From: "Graham Johnson" <grahamj@>
> > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > Sent: Friday, December 12, 2008 1:02 AM
> > > Subject: [amibroker] Null seems to plot as zero
> > >
> > >
> > > > I'm trying to plot a variable that should only have positive
> > values or
> > > > null
> > > >
> > > > The following line results in the Y axis including zero so
all
> of
> > the
> > > > data is compressed at the top of the chart
> > > > Plot(IIf(xaInLongTrade, xaPlotValue, Null), xPlotLabel,
> > colorGreen,
> > > > styleThick);
> > > >
> > > > If the Iif is removed then the result is fine - the Y axis
> range
> > fits
> > > > the data
> > > > Plot(xaPlotValue, xPlotLabel, colorGreen, styleThick);
> > > >
> > > > I've even tried setting any negatives or zeros to null prior
to
> > Plot
> > > > but the results are still the same
> > > > xaPlotValue = IIf(xaPlotValue <= 0, Null, xaPlotValue);
> > > >
> > > > The battle with this has gone on for over a week now, can
> anyone
> > help
> > > > please?
> > > >
> > > > Graham
> > > >
> > > >
> > > > ------------------------------------
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------------------------------------
**** IMPORTANT ****
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*********************
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