[amibroker] Re: How to "Error Trap" in Automatic Analysis?

["gp_sydney" <gp.investment@xxxxxxxxx>]

Take a look at the PopupWindow function.

Be aware though that the AFL code won't stop while the window is
displayed, so if you do an exploration over a few hundred stocks where
every stock gives a popup window, you could end up with dozens of the
windows showing at the same time.

GP


--- In amibroker@xxxxxxxxxxxxxxx, "Ken Close" <ken45140@xxx> wrote:
>
> I do not recall this being discussed (but of course I forget lots of
past
> messages).
>  
> In making some code to be run in AA by an inexperienced AB user, I
want to
> error trap some situations that are likely to be encountered and
then give a
> message to the user instead of the program dropping into the Formula
Editor
> with a yellow line on the offending line.  
>  
> In general, is it possible?
>  
> I realize the answer is to set up the program to avoid every
situation where
> the error might occur.
>  
> In my case, I have a subscripted formula in a loop which will yield a
> "subscript out of range" if the current symbol contains less days of
data
> than the Parameters are set for.
>  
> I set a startdate, calculate a "FirstBar" for the range that is set, and
> then use a "FirstBar - 1" subscript, which works fine if the calculated
> FirstBar is always greater than the actual first bar.  If the data
does not
> exist earlier than the date set for FirstBar, then the error pops up.
>  
> Thus my question:  is it possible to sense the error condition and
display
> an error message of the users choosing?
>  
> The less elegant way is to instruct the user that if they see a
yellow line
> in the Formula Editor, to check that the FirstBar date is set at or
after
> the beginning of the shortest data symbol.
>  
> Comments?
>  
> Ken
>



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