Download A Practical Guide to Averaging Functions by Gleb Beliakov, Humberto Bustince Sola, Tomasa Calvo PDF

By Gleb Beliakov, Humberto Bustince Sola, Tomasa Calvo

ISBN-10: 3319247514

ISBN-13: 9783319247519

This e-book deals an easy-to-use and practice-oriented reference advisor to mathematical averages. It provides alternative ways of aggregating enter values given on a numerical scale, and of selecting and/or developing aggregating features for particular functions. development on a prior monograph by way of Beliakov et al. released via Springer in 2007, it outlines new aggregation equipment constructed in the mean time, with a distinct specialize in the subject of averaging aggregation capabilities. It examines contemporary advances within the box, equivalent to aggregation on lattices, penalty-based aggregation and weakly monotone averaging, and extends a few of the already present tools, akin to: ordered weighted averaging (OWA), fuzzy integrals and blend services. a considerable mathematical history isn't really referred to as for, as the entire proper mathematical notions are defined right here and said on including a wealth of graphical illustrations of specified households of aggregation features. The authors generally concentrate on useful purposes and provides imperative value to the conciseness of exposition, in addition to the relevance and applicability of the stated tools, providing a useful source for computing device scientists, IT experts, mathematicians, method architects, wisdom engineers and programmers, in addition to for a person dealing with the difficulty of ways to mix a number of inputs right into a unmarried output value.

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A Practical Guide to Averaging Functions

This ebook bargains an easy-to-use and practice-oriented reference advisor to mathematical averages. It offers alternative ways of aggregating enter values given on a numerical scale, and of selecting and/or developing aggregating services for particular purposes. construction on a prior monograph by means of Beliakov et al.

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Extra resources for A Practical Guide to Averaging Functions

Example text

N ), we do not expect the output f (˜x) to be substantially different from f (x). The Lipschitz constant M bounds the factor by which the noise is magnified. , a polynomial). Thus based on their values, or graphs, we cannot distinguish between continuous and discontinuous integrable functions, as the values of both functions coincide up to a tiny difference (which we can make as small as we want). A computer will not see any difference between the two types of functions. Mathematically speaking, the subset of continuous functions C(Ω) is dense in the set of integrable functions L 1 (Ω) on a compact set.

It consists in building a hyperplane which fits the data best in the least squares sense. Let the equation of the hyperplane be f (x) = a0 + a1 x1 + a2 x2 + · · · + an xn . 7 Supplementary Material: Some Methods for Approximation and Optimization 39 Then the vector of coefficients a can be determined by solving the least squares problem K n (a0 + minimize k=1 ai xik − yk )2 , i=1 where xik is the i-th component of the vector xk . Linear regression problem can be immediately generalized if we choose n f (x) = a0 + ai Bi (xi ), i=1 where Bi are some given functions of the i-th component of x.

A, 0) ≤ f (e, . . , e, 0) = 0. Similarly, if a > e then a = f (a, . . , a, 1) ≥ f (e, . . , e, 1) = 1. 3 Classification and General Properties 15 The interpretation is similar: the value of any inputs larger than a can make the output f (x) = 1, even if none of the inputs is actually 1. On the other hand, if b is not a one divisor, then the output cannot be one if all the inputs are no larger than b. The following property is useful for construction of n-ary aggregation functions from a single two-variable function.

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