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You have this
DateNum () == StartDate
But should be
dt == StartDate
You might also find you need to add this line
SetBarsRequired(10000,10000);
--
Cheers
Graham Kav
AFL Writing Service
http://www.aflwriting.com
2008/7/11 tipequity <l3456@xxxxxxxxxx>:
> The trace statement gives the following error message that I get:
>
> [2392] Bar: 2890 StartDateBar {EMPTY} C[Bar] {EMPTY}
>
> I don't understand why it works on loadup then it fails upon changes
> to paramdate.
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "tipequity" <l3456@xxx> wrote:
>>
>> Thanks Graham for your reply. I still get an error message when I
>> click on the chart or change the dates. TIA
>>
>> --- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@> wrote:
>> >
>> > You might be choosing dates that do not appear in the symbol data
>> >
>> > StartDateBar = LastValue(ValueWhen ( DateNum () <=
>> StartDate,BarIndex ()));
>> > EndDateBar = LastValue(ValueWhen( DateNum () <= EndDate, BarIndex
>> () ));
>> >
>> > --
>> > Cheers
>> > Graham Kav
>> > AFL Writing Service
>> > http://www.aflwriting.com
>> >
>> >
>> >
>> > 2008/7/10 tipequity <l3456@>:
>> > > I have written the following code to plot % chg in price of
> ticker
>> > > from starting date to ending date (using parameters). I have to
>> > > problems:
>> > > 1. when I change the date it crashes, point to from date in the
>> title.
>> > > 2. when it works, it draws a horizontal line from first visible
>> bar
>> > > to the starting date. I want to eliminate this line. TIA
>> > >
>> > > dt=DateTime();
>> > > StartDate = ParamDate ( "Start Date" , Date () );
>> > > EndDate = ParamDate ( "End Date" , Date () );
>> > > StartDateBar = LastValue(ValueWhen ( DateNum () == StartDate,
>> > > BarIndex ()));
>> > > EndDateBar = LastValue(ValueWhen( DateNum () == EndDate,
> BarIndex
>> > > () ));
>> > >
>> > > Ticker = 0;
>> > >
>> > > for (Bar = StartDateBar; Bar < EndDateBar-1; Bar++)
>> > > {
>> > > ticker[bar] = 100 *(( C[Bar] - C[ StartDateBar ])/C
>> [StartDateBar ]);
>> > > //_TRACE("Bar: " + Bar + " StartDateBar " + C[ StartDateBar ]
> + "
>> C
>> > > [Bar] " + C[Bar]);
>> > > }
>> > > Plot( ticker, Name(), colorBlue );
>> > >
>> > > SetChartOptions( 1, chartShowDates );
>> > > PlotGrid( 0, colorYellow );
>> > > Title = "From: " + WriteVal(dt[StartDateBar],formatDateTime) + "
>> > > To: " + Date() + " - " + "{{VALUES}}" + "\n" +
>> > > Interval(2) + " - " + _DEFAULT_NAME();
>> > >
>> > >
>> > > ------------------------------------
>> > >
>> > > Please note that this group is for discussion between users
> only.
>> > >
>> > > To get support from AmiBroker please send an e-mail directly to
>> > > SUPPORT {at} amibroker.com
>> > >
>> > > For NEW RELEASE ANNOUNCEMENTS and other news always check
> DEVLOG:
>> > > http://www.amibroker.com/devlog/
>> > >
>> > > For other support material please check also:
>> > > http://www.amibroker.com/support.html
>> > > Yahoo! Groups Links
>> > >
>> > >
>> > >
>> > >
>> >
>>
>
>
>
> ------------------------------------
>
> Please note that this group is for discussion between users only.
>
> To get support from AmiBroker please send an e-mail directly to
> SUPPORT {at} amibroker.com
>
> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
>
> For other support material please check also:
> http://www.amibroker.com/support.html
> Yahoo! Groups Links
>
>
>
>
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