[amibroker] How to add numbers from ASCII?

[Panos Boufardeas <panosbouf@xxxxxxxxxxx>]

Hi
I would like to know if there is any example how to add 2 numbers from 
different lines in afl by reading ascii files?

For example if the file is like this
YM, sell,-1,11.100
YM,buy,1, 11.000
How can I have the results =100  ?

I was reading 
this 
<http://finance.groups.yahoo.com/group/amibroker/message/113223>http://finance.groups.yahoo.com/group/amibroker/message/113223 
but I cannot manage.

Thank you
Panos


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