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Because it is absolutely critical to fully understand the circumstances that cause your code to be invoked and what your code can expect to see when it is invoked.
The example I gave in this thread is borderline insane, because think about it, your code is attached to one chart pane, and yet it is invoked twice every second. But only if a user clicks inside your chart pane. And then if it is invoked twice, the first time it will see a view from *the top chart pane*.
That means that the number of visible bars will return *different* than the number of visible bars for which the user actually applied your code to.
That makes debugging your code an absolutely head banging task, because you can't understand why your code is reporting one thing when clearly the pane it was applied to has a known set of state to you.
Any system that wants to be used with real money has to explain in total detail these basic things.
Maybe these facts are not relevant to most people here, so be it. But if I'm to end up spending hundreds of hours building a system and then thousands of dollars to buy the number of AmiBroker licenses that I would need to deploy in my firm, I want to know exactly what I'm dealing with up front.
--- In amibroker@xxxxxxxxxxxxxxx, "sidhartha70" <sidhartha70@xxx> wrote:
>
> Conrad, why are you so obsessed with the minutiae of AB's calls to different chart panes...??
>
> How is that going to help you...? I get the feeling you are looking at AFL like an event driven language...
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Conrad Joach" <consolejoker@> wrote:
> >
> > Maybe I'm the only person in the world having a hard time getting grips on how AmiBroker actually works. I'm about to give up because I just can't get a strong understanding of these basic things. And yes I've submitted this to support but it's the weekend and I'm wasting hours on this.
> >
> > Do the following and tell me what you see.
> >
> > 1) Create a new blank chart with minutely interval. Add a Price series on it. Make sure that your chart refreshes are set to once per second (1) in the Intraday tab in Preferences.
> >
> > 2) Using the following AFL script, create a 2nd chart pane and add the AFL below.
> >
> > Script: _TRACE(NumToStr(NOW(4)));
> >
> > 3) Now click inside the pane that has the AFL from below. Notice that every time its invoked, its invoked twice? Look at the seconds part of the time, there are two printouts per second in the trace window, and one value is for the top pane, and the other value is for the bottom pane.
> >
> > 4) Now click in the top pane (not where the AFL is applied to), you'll see it goes back to printing just once per second.
> >
> > Why is this happening? If I create a 2nd pane in a chart window, and add AFL to it, why on earth would it be called twice when I click *inside* the pane and once when I click outside the pane?
> >
> > Am I wrong or shouldn't it only be called once per chart update interval, not twice? And to make matters worse, when it is called for the top chart pane (not the one we applied it to) it will receive a very different view of the state of AmiBroker. Things like number of visible bars may be different than the bottom pane.
> >
>
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