19. The method of claim 1 , wherein there are a plurality of different potential inputs, and further comprising: determining which of the plurality of different potential inputs to use as actual inputs by quantifying the importance of each potential input to the system and iteratively discarding those potential inputs that do not make a significant contribution.
19. The method of claim 1 , wherein there are a plurality of different potential inputs, and further comprising: determining which of the plurality of different potential inputs to use as actual inputs by quantifying the importance of each potential input to the system and iteratively discarding those potential inputs that do not make a significant contribution. 20. The method of claim 19 wherein the importance of each potential input is quantified by calculating the relative importance of the potential inputs.