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Ken,
Although it is possible to wrap Foreign inside for loop it is
not recommended
performance-wise because of the fact
that exploration already iterates through all tickers.
Exploration in fact already provides exactly the 'matrix' of
values - all bars for all tickers
but the output is not arranged into 'matrix' but just the
list.
This in fact is the advantage because you can have multiple
values (columns)
per each date-ticker pair, while 'matrix' gives you only one
value.
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Ken Close
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">AmiBroker List
Sent: Monday, April 14, 2003 12:14
PM
Subject: [amibroker] Matrix
Construction
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?<FONT
face=Verdana size=2> 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<FONT
face=Verdana size=2>----is it even possible?
Using an example from
the Readme
·<FONT
face="Courier New"> <SPAN
lang=en-us><SPAN
lang=en-us> /* a
sample low-level implementation of Profit-target stop in AFL:
*/
Buy =
Cross( MACD(), Signal() );<SPAN
lang=en-us>
<FONT face="Courier New"
size=2>priceatbuy=0;<SPAN
lang=en-us>
for( i = 0;
i < BarCount; i++ )<SPAN
lang=en-us><FONT
face="Courier New" size=2>{<SPAN
lang=en-us><FONT
face="Courier New" size=2> if( priceatbuy ==
0 && Buy[ i ] )<SPAN
lang=en-us><FONT
face="Courier New" size=2> priceatbuy =
BuyPrice[ i ];<SPAN
lang=en-us>
<FONT face="Courier New"
size=2> if( priceatbuy > 0 &&
SellPrice[ i ] > 1.1 * priceatbuy )<SPAN
lang=en-us><SPAN
lang=en-us><FONT face="Courier New"
size=2> {<SPAN
lang=en-us><SPAN
lang=en-us><FONT face="Courier New"
size=2> Sell[ i ] =
1;<SPAN
lang=en-us><FONT face="Courier New"
size=2> SellPrice[ i ] = 1.1 *
priceatbuy;<SPAN
lang=en-us><FONT
face="Courier New"
size=2> priceatbuy =
0;<SPAN
lang=en-us><FONT face="Courier New"
size=2> }<SPAN
lang=en-us><SPAN
lang=en-us><FONT face="Courier New"
size=2> else<SPAN
lang=en-us><SPAN
lang=en-us><FONT face="Courier New"
size=2> Sell[ i ] =
0;<SPAN
lang=en-us><FONT face="Courier New"
size=2>}<SPAN
lang=en-us>
What is the Loop
command you would put "on top of"<SPAN
lang=en-us> or "around"<SPAN
lang=en-us> 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?
<FONT face=Verdana
size=2>Comments?
<FONT face=Verdana
size=2>Ken<SPAN
lang=en-us>Send
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