1. A method of generating a second set of equations requiring reduced numbers of computations from a first set of general equations, wherein each general equation defines a coefficient in terms of a set of samples and a plurality of functions having respective values dependent upon each sample, said method comprising the steps of: assigning a first set of tokens to the plurality of functions such that every value of the plurality of functions having a different magnitude is assigned a different token, thereby permitting each general equation to be defined by the set of samples and their associated tokens; evaluating each of the general equations as defined by the set of samples and associated tokens and grouping the samples having the same associated token together into separate groups; assigning a second set of tokens to represent a plurality of unique combinations of the samples; and generating the second set of equations based on at least the first and second sets of tokens.