[amibroker] parameter dependent on date

["aleskresta" <kresta.ales@xxxxxxxxx>]

Hi there,

   I need some help please:( I have got, let's say this simple system:

period1 = Optimize( "Perioda 1", 3,  1, 30, 1 );
period2 = Optimize( "Perioda 2", 5,  1, 120, 2 );

cena = ParamField("Cena", field = 3 ); 

Buy  = Cross(EMA(cena,period1),EMA(cena,period2));
Sell = Cross(EMA(cena,period2),EMA(cena,period1));

   but now, lets say I want to have the variables to have its value 
dependet on date. Lets say that

   for bars between 1.1.2000 and 1.1.2001 it will be 
period1 = 1;
period2 = 2;
   for bars between 1.1.2001 and 1.1.2002 it will be 
period1 = 5;
period2 = 10;
   for bars between 1.1.2002 and 1.1.2003 it will be 
period1 = 2;
period2 = 4;

   How can I write it, so I can run AA from 1.1.2000 till 1.1.2003. 
Please help, i read the help file, but did not find any answer:( Tha 
nks a lot :)



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