Re: [amibroker] Re: Code Help

[Graham <kavemanperth@xxxxxxxxx>]

Sorry ignore previous response as I made mistake, tried to stop it
sending but was too slow

I had a quick look at your total code and made some mods to help. here
is one way to do it

SetBarsRequired(10000,10000);
da = Date();
dn = DateNum();
bi = BarIndex();


StartDate = ParamDate ( "Start Date" , da );
EndDate = ParamDate ( "End Date" , da );

StartDateBar = LastValue( ValueWhen ( dn <= StartDate ,bi ) );
EndDateBar = LastValue( ValueWhen( dn <= EndDate, bi ) );

StartDateC = LastValue( ValueWhen ( dn <= StartDate ,C ) );
EndDateC = LastValue( ValueWhen( dn <= EndDate, C ) );

Ticker = IIf( bi>=StartDateBar, 100 * ( C - StartDateC ) / StartDateC, Null );

Plot( ticker, Name(), colorBlue );

SetChartOptions( 1, chartShowDates );
PlotGrid( 0, colorYellow );
Title =
 "From: " + WriteVal( DateTimeConvert( 2, StartDate ), formatDateTime )
 + " To: " + WriteVal( DateTimeConvert( 2, EndDate ), formatDateTime )
 + " - " + "{{VALUES}}"  + "\n"
 + Interval(2) + " - " + _DEFAULT_NAME();


-- 
Cheers
Graham Kav
AFL Writing Service
http://www.aflwriting.com




2008/7/11 Graham <kavemanperth@xxxxxxxxx>:
> 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();
>>> > >
>>> > >
>>> > > ------------------------------------

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