I am new to this QUCS. Does anyone know where to find a tutorial on the optimizer? How does the cost function work? I want to define a filter and i want it to optimize it based on my inputs, but I don't understand how the parameters: less, maximize, minimize, greater work.. My intuition tells me to set it up one way, and the program the program complains the cost function cannot be negative. Well attenuation is in negative dBs so I have to say -10 etc... it complains.... Anyone has done this?

Any Ideas?