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Hi Graham,
I need to optimize on the functions, so their definition should change
for different optimization parameter, and since I cannot define them
within if statements I don't see how I could achive whar I want using
your idea.
Thanks
Ly
--- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@xxx> wrote:
>
> Define the functions first, but only use them within your limited
areas of code
> Even if you have to define different functions for each limited area
> --
> Cheers
> Graham Kav
> AFL Writing Service
> http://www.aflwriting.com
>
>
>
> On 09/01/2008, loveyourenemynow <loveyourenemynow@xxx> wrote:
> > Thanks Mike,
> >
> > but my code is written in such a way that functions play the roles of
> > parameters(to avoid errors and facilitate debugging and changes),
> > trying to mimic polymorphism of OO language.
> > Problem is that i think functions cannot be changed at runtime during
> > backtesting , but have to be declared one and stay the same.
> > These functions return different prices (O/C) with different time
> > delays so I could rewrite the code and use one functions taking 2
> > paramters , one for delay and the other for O/P.
> >
> > This what it comes to my mind now, but I would like to know why is tht
> > error produced.
> > what if I declare empty functions (like virtual declaration in c++) at
> > as an empty prototype at global scope and implement and give some
> > parameter dependent implementations later. Again is all about mimic
> > polymorphism.
> >
> > Thanks
> > Ly
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@> wrote:
> > >
> > > Read http://www.amibroker.com/guide/a_userfunctions.html
> > >
> > > Then try changing your function signature to just take a parameter
> > > and move the declaration out of the if statement.
> > >
> > > e.g.
> > > function P1f(sys) {
> > > if (sys == 1) {
> > > ...
> > > }
> > > ...
> > > }
> > >
> > > Alternatively, you could create different functions for each
scenario
> > > and check a condition in your calling code to determine which one to
> > > call.
> > >
> > > e.g.
> > > ...
> > > if (sys == 1) {
> > > P1f();
> > > } else {
> > > OtherP1f();
> > > }
> > > ...
> > > function P1f() {
> > > ...
> > > }
> > > function OtherP1f() {
> > > ...
> > > }
> > >
> > > I don't understand your scope question. But you may find the
> > > documentation for local/global helpful:
> > >
> > > http://www.amibroker.com/guide/keyword/local.html
> > > http://www.amibroker.com/guide/keyword/global.html
> > >
> > > Mike
> > >
> > > --- In amibroker@xxxxxxxxxxxxxxx, "loveyourenemynow"
> > > <loveyourenemynow@> wrote:
> > > >
> > > > I am trying to optimize over diffeent types of systems and I
need to
> > > > define function accordingly, but I get and error with this code
> > > >
> > > > if (sys==1){
> > > > ///cc->co entry at close exit at day after open
> > > > SetOption("ActivateStopsImmediately",True);
> > > > SetTradeDelays(0,0,0,0);
> > > > ShortPrice=C;
> > > > BuyPrice=C;
> > > > CoverPrice=O;
> > > > SellPrice=O;
> > > > function P1f() {return Ref(C,-1);}
> > > > function P2f() {return Ref(C,0);}
> > > > ApplyStop(stopTypeNBar,stopModeBars,1,1);
> > > > dc=1;
> > > > MaxPosPer=1;
> > > > }
> > > >
> > > > while outside brackets it runs.
> > > >
> > > > In a similar way variable I noticed that arrays declared at
> > > different
> > > > scope levels are not accessible to the lower levels (i think scalr
> > > > yes) unless they are defined at gloabal level,
> > > > This is different from c++ scope conventions.
> > > > So the only way to share among different scopes (I mean
portions of
> > > > code at differnt levels of {} nesting), seems to declare them
> > > globally.
> > > > Am I correct?
> > > >
> > > > Thanks
> > > > Ly
> > > >
> > >
> >
> >
> >
> >
> > 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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