Queries on AFL

J

justprash

All,

I am a newbie on AFL although I am an experienced trader. I am trying to get used to this language. In fact I wrote the following script and when I run it, I don't get the intended results. Can you please help me with this?

The idea of the code is to give Buy signal for all the Stocks / Futures whose EMA follows:

Buy - If latest value of 50 EMA > 50 EMA > 100 EMA
Sell - If latest value of 50 EMA < 50 EMA < 100 EMA



Code:
_SECTION_BEGIN("AFL Example");

LongMA = EMA( C, 100 );
MidMA = EMA( C, 50 );
ShortMA = EMA( C, 20 );
Buy = Cross( ShortMA, MidMA ) AND Cross(MidMA,LongMA);
Sell = Cross( LongMA, MidMA ) AND Cross(MidMA,ShortMA);

Filter=1;
AddTextColumn( FullName(), "Company Name" );
AddColumn( Buy, "Buy", 1 );
AddColumn( Sell, "Sell", 1 );
AddColumn( C, "Close", 1.3 );
AddColumn( H, "High", 1.3 );
AddColumn( ShortMA, "Short MA", 1,3 );
AddColumn( MidMA, "Mid MA", 1,3 );
AddColumn( LongMA, "Long MA", 1,3 );
_SECTION_END();


Please help.

Thanks,
Prash
 
See code below. Not tested

Code: 
_SECTION_BEGIN("AFL Example");

LongMA = EMA( C, 100 );
MidMA = EMA( C, 50 );
ShortMA = EMA( C, 20 );
Buy = Cross( ShortMA, MidMA ) AND Cross(MidMA,LongMA) || ShortMA > MidMA and MidMA > LongMA;
Sell = Cross( LongMA, MidMA ) AND Cross(MidMA,ShortMA) || ShortMA < MidMA and MidMA < LongMA;

Filter=Buy || Sell;
AddTextColumn( FullName(), "Company Name" );
AddColumn( Buy, "Buy", 1 );
AddColumn( Sell, "Sell", 1 );
AddColumn( C, "Close", 1.3 );
AddColumn( H, "High", 1.3 );
AddColumn( ShortMA, "Short MA", 1,3 );
AddColumn( MidMA, "Mid MA", 1,3 );
AddColumn( LongMA, "Long MA", 1,3 );
_SECTION_END();

Do you really wanna have a cross of shortma with midma and cross midma with longma at the same time? Do yo u know that this should occur very rare both crossing at the same bar.

This would make more sense Cross( ShortMA, MidMA ) AND MidMA > LongMA for a buy signal
 
In my opinion this is what you were looking for

Code: 
_SECTION_BEGIN("AFL Example");
LongMA = EMA( C, 100 );
MidMA = EMA( C, 50 );
ShortMA = EMA( C, 20 );
Buy = Cross( ShortMA, MidMA ) AND MidMA > LongMA ;
Sell = Cross( LongMA, MidMA ) AND MidMA < LongMA;

Filter=Buy || Sell;
AddTextColumn( FullName(), "Company Name" );
AddColumn( Buy, "Buy", 1 );
AddColumn( Sell, "Sell", 1 );
AddColumn( C, "Close", 1.3 );
AddColumn( H, "High", 1.3 );
AddColumn( ShortMA, "Short MA", 1,3 );
AddColumn( MidMA, "Mid MA", 1,3 );
AddColumn( LongMA, "Long MA", 1,3 );
_SECTION_END();

(ShortMA > MidMA AND MidMA > LongMA) or (ShortMA< MidMA AND MidMA < LongMA) would produce too many signals.
 
Thanks a ton for highlighting the mistake and the correct way to implement the logic that I had in mind.

Much Appreciated.

Thanks,
Prash
 
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