[amibroker] Re: How to Skip Empty Symbols when looping through wishlist

["Mike" <sfclimbers@xxxxxxxxx>]

Actually, you are running into a documented side effect of IIF usage. 

Specifically; the IIF statement always executes BOTH the true and the 
false branches of the code. So, you will always have your Count++ code 
executed regardless of the value of the IsNull expression.

Refer to the user guide for details:
http://www.amibroker.com/guide/afl/afl_view.php?id=72

Mike


--- In amibroker@xxxxxxxxxxxxxxx, "Paolo Cavatore" <pcavatore@xxx> 
wrote:
>
> Does anyone know how to skip empty symbols when looping through a 
> list of them?
> 
> The code below shows that IsNull function doesn't return TRUE for 
> empty symbols.
> 
> Thanks,
> 
> paolo
> 
> // EmptySymbols finder
> // retrive comma-separated list of symbols
> // from Group 0
> list = CategoryGetSymbols(categoryGroup, 0); 
> 
> Count = 0;
> 
>    for( i = 0; ( sym = StrExtract( list, i ) ) != ""; i++ ) 
>    { 
>         SetForeign(sym);      
> 	myforeign = C;
> 	RestorePriceArrays();
> 	
> 	//if the symbol is empty Count is not increased
> 	IIf(IsNull(myforeign), Count, Count++);
>         _TRACE("symbol " + sym);
>         _TRACE("Count " + Count);
>         _TRACE("IsNull " + IsNull(myforeign));
> 
>     }
>




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