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[amibroker] File I/O within AFL code.



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I'm trying to set up an AA/Explore where AB puts today's Buys and Sells into
Watch lists labeled Buy Candidates and Sell Candidates, which are the
original List 1 and List 2---and popup in that order when i add a symbol to
a watch list and are displayed that way when i open Watch lists.

Before i use the CategoryAddSymbol, i want to remove all symbols from the
above 2 watch lists but the sample from the Help does not do it.   It seems
to work with list 11, but i always need to add a symbol to list 11, before
the removed ones disappear--i know a watch list will not be displayed if it
is empty, but once i remove all symbols, i would think it would be empty!!!
I'm using it with a simple Scan or Explore.

Can someone tell me why it does not work on List 1 or 2, but does on 11???
below is the code i am using...
thanks,
ron




Buy=Ref(L,-1)<Ref(L,-2) AND Ref(L,-1)<L AND C>Ref(H,-1);
Sell=Ref(H,-1)>Ref(H,-2) AND Ref(H,-1)>H AND C<Ref(L,-1);

Filter=1;
AddColumn (Buy, "Buy");
AddColumn (Sell, "Sell");

//Clear watchlist

if( LastValue( C ) > 1)
{
   CategoryRemoveSymbol( "", categoryWatchlist, 1);
}

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