This is not working since I'm not trying to count null string symbols
but symbols whit no data in it

regards,

p

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


symbols are strings, try




Count = Count + (myforeign != "");







Wednesday, November 19, 2008, 4:35:18 AM, you wrote:




> Having changed

> IIf(IsNull(myforeign), Count, Count++);

> into

> Count = Count + IIf(IsNull(myforeign), 1, 0);

> is not working either.




> It really seems like IsNull function doesn't return True for empty

> symbols.




> New entire code below




> // 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

> Count = Count + IIf(IsNull(myforeign), 1, 0);




> _TRACE("symbol " + sym);

> _TRACE("Count " + Count);

> _TRACE("IsNull " + IsNull(myforeign));




> }







> --- In amibroker@yahoogroups.com, "Mike" <sfclimbers@...> wrote:




>> 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@yahoogroups.com, "Paolo Cavatore" <pcavatore@>

>> 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));

>> >

>> > }

>> >