[amibroker] Matrix Construction

["Ken Close" <closeks@xxxxxxxx>]

Yesterday, Bruce Robinson described an important feature of the Trade program, namely the 2-D matrix arrangement that allows Dates down the rows and Tickers across the columns.

If you add the concept that a single variable for each ticker and each date are on "sheets" just like the worksheets in Excel, then do you not have the makings of a structure that allows ranking of calculated variables on each date for each ticker?  And more, perhaps even portfolio trading?

I was about to try this but am stuck on how to reference individual tickers with a subscript within a For Loop----is it even possible?

Using an example from the Readme

·       /* a sample low-level implementation of Profit-target stop in AFL: */
Buy = Cross( MACD(), Signal() );

priceatbuy=0;

for( i = 0; i < BarCount; i++ )
{
     if( priceatbuy == 0 && Buy[ i ] )
     priceatbuy = BuyPrice[ i ];

     if( priceatbuy > 0 && SellPrice[ i ] > 1.1 * priceatbuy )
     {
       Sell[ i ] = 1;
       SellPrice[ i ] = 1.1 * priceatbuy;
       priceatbuy = 0;
     }
     else
       Sell[ i ] = 0;
}
What is the Loop command you would put "on top of" or "around" this code to cycle thru the tickers? And how do you even make it pick a watchlist?  It seems like it would use whatever watchlist you select as usual, but how to reference and keep track of the tickers by date?

Comments?

Ken








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