A tool for controlling the operation of a system, said tool comprising (160): a unit of data acquisition (102), receiving said unit data acquisition (102) signals (152, 154, 156, 158, 160) detectors, said detectors on a system that is controlled and which provides instantaneous parametric exposures of system operation are arranged; a memory (106) storing a training set, said training set containing a plurality of vectors system, being representative vectors each of said system operating state expected of such a system being controlled; a processor (104) receiving instantaneous exposures of said unit data acquisition (102) and comparing the instantaneous exposures received with the vectors of the system from said memory (106), using said processor (104) selectively a function of similarity to said comparison; and an output device (108), said processor (104) results of said comparison to said output device (108); further characterized in that the similarity function applied by said processor (104) is an operator similarity stratification lenticular in which a test ratio limited angle is modified to have a nonlinear base comprising at least one selected line segment between the group of polynomial curve, an elliptical arc, a trigonometric function, a set of discontinuous line segments, one espline and a lookup table.
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