[amibroker] Optimizing operands?

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Is it possible to optimize an operand, like:

opt1 = optimize("operand",1,1,2,1);

firstparam = iif(opt1 == 1,">",0); //How can you specify an operand here?
firstparam = iif(opt1 == 2,"<",firstparam);

Any way to get this to work?

Adrian