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[amibroker] exporting to txt file modified data



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I use the export dll supplied on the Amibroker library to back up and make
some modifications to my databases. Thanks to who supplied it, absolutely
fantastic.
I have used this before to round off the data supplied in the far past. This
works ok when you just need to make changes to the OHLCV data directly, but
I want to remove all zero volume days from the database without it taking a
month of Sundays to complete.
I have tried adding filters and additional buy condition to the line 
Buy=bhExportAsMetaStock("c:\\MSBackup");

Such as:

Buy=bhExportAsMetaStock("c:\\MSBackup") AND V>0;

But it still exports the whole data without change.

Can anyone help me with a method of doing this
TIA

Cheers,
Graham
http://groups.msn.com/ASXShareTrading
http://groups.msn.com/FMSAustralia



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