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Tim,
This happens because you want to plot NEGATIVE values
using log scale. (rate of change can be negative)
The logarithm of negative argument does not exist in mathematics.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "Tim Gadd" <timgadd@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Monday, March 10, 2003 6:09 PM
Subject: [amibroker] Re: Indicator Code not working after upgrade
> Tomasz,
>
> I tried that (see last paragraph of original message), but then the
> indicator doesn't plot as a histogram. It plots all lines from the
> bottom of the pane. The only way I can get it to plot as a histogram
> is if I remove the Logarithmic check box and I don't want to do that.
> I want price plotted using Logarithmic scale.
>
> Thanks for the lightning fast response.
>
> Tim Gadd
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
> wrote:
> > Hello,
> >
> > There is no styleLog anymore.
> > Use "logarithmic" check box in the Indicator Builder instead.
> >
> >
> > Plot (RelRocOfPrice, "RelRoc of Price", barcolor, styleOwnScale |
> styleHistogram); // don't use styleLog
> >
> > Best regards,
> > Tomasz Janeczko
> > amibroker.com
> > ----- Original Message -----
> > From: "Tim Gadd" <timgadd@xxxx>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Monday, March 10, 2003 5:56 PM
> > Subject: [amibroker] Indicator Code not working after upgrade
> >
> >
> > > Prior to upgrading to version 4.3, the following code worked. Now
> I'm
> > > getting the error message ...
> > >
> > > Unknown identifier at line 29, column 10:
> > > Plot (RelRocOfPrice, "RelRoc of Price", barcolor, styleLog |
> > > -----------------------------------------------------------^
> > >
> > > BTW, this indicator code is placed in the builtin price indicator
> > > formula.
> > >
> > > //Start of indicator code
> > >
> > > Period = 107;
> > >
> > > UpDay = C > Ref(C,-1);//define an up day
> > > UpDays = Sum(UpDay, Period);//# of up days in the period
> > > AvgUpRoc = MA(ROC(C,1) * UpDay,UpDays);//Average of the 1-day
> ROCs
> > > for up days over the lookback period
> > > RelUpRoc = ROC(C,1) / Ref(AvgUpRoc,-1);//Today's 1-Day ROC
> compared
> > > to yesterday's AvgUpRoc
> > > DnDay = C < Ref(C,-1);//define a down day
> > > DnDays = Sum(DnDay, Period);//# of down days in the period
> > > AvgDnRoc = MA(ROC(C,1) * DnDay,DnDays);//Average of the 1-day
> ROCs
> > > for down days over the lookback period
> > > RelDnRoc = -(ROC(C,1) / Ref(AvgDnRoc,-1));//Today's 1-Day ROC
> > > compared to yesterday's AvgDnRoc
> > >
> > > RelRocOfPrice = IIf(UpDay,RelUpRoc-1,RelDnRoc+1);
> > >
> > > BarColor = IIf(UpDay, colorDarkGreen, IIf(DnDay,
> > > colorRed,colorBlack) );
> > >
> > > Plot (RelRocOfPrice, "RelRoc of Price", barcolor, styleLog |
> > > styleOwnScale | styleHistogram); // THIS IS THE PROBLEM LINE
> > >
> > > Plot(MA(RelRocOfPrice,3),"",colorLightBlue,styleHistogram |
> > > styleThick | styleOwnScale);
> > >
> > > //--Indicator-End--
> > >
> > > If I remove the styleLog parameter from the problem line, the
> error
> > > message goes away, but the indicator no longer plots as a
> histogram.
> > > It plots all lines starting from the bottom of the pane. I have
> > > Logarithmic checked at the bottom of the indicator builder, as I
> want
> > > to price plotted using a logarithmic scale.
> > >
> > > Can someone spot the problem? Help appreciated.
> > >
> > > Tim Gadd
> > >
> > >
> > >
> > >
> > > Send BUG REPORTS to bugs@xxxx
> > > Send SUGGESTIONS to suggest@xxxx
> > > -----------------------------------------
> > > Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
> > > (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> > > --------------------------------------------
> > > Check group FAQ at:
> http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
>
>
> Send BUG REPORTS to bugs@xxxxxxxxxxxxx
> Send SUGGESTIONS to suggest@xxxxxxxxxxxxx
> -----------------------------------------
> Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
> (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> --------------------------------------------
> Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
Send BUG REPORTS to bugs@xxxxxxxxxxxxx
Send SUGGESTIONS to suggest@xxxxxxxxxxxxx
-----------------------------------------
Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
(Web page: http://groups.yahoo.com/group/amiquote/messages/)
--------------------------------------------
Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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