[amibroker] shifting backtest in time

["forticus64" <m.ott@xxxxxxx>]

Would like to backtest one a time span to check for "aging"
of the system. Is it possible to address the Range fields
of the Automatic Analysis window from within mysystem.afl,
such as ...

 end_date = optimize("end_date",today,today, year_ago, -days)
 start_date = end_date - days  // or end_date + (-days)   

or similar/better using bars ?

Further to see how the system behaves with time shift I would 
be interested to sum up the contents of colums or somehow get the
amount of rows of each:

addcolumn(buy,"Buy",1.0);
addcolumn(sell,"Sell",1.0);
addcolumn(short,"Sell",1.0);
addcolumn(cover,"Sell",1.0);

mysignal = ( sum(buy)+sum(cover) ) / ( sum(sell)+sum(short) );
plot(mysignal, ...);

thanks for any comments





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