Approximate calculation of the Caputo-type fractional derivative from inaccurate data. Dynamical approach. (English) Zbl 1498.26016

Surkov, Platon G.

Fract. Calc. Appl. Anal. 24, No. 3, 895-922 (2021).

Summary: A specific formulation of the “classical” problem of mathematical analysis is considered. This is the problem of calculating the derivative of a function. The purpose of this work is to construct an algorithm for the approximate calculation of the Caputo-type fractional derivative based on the methods of control theory. The input data of the algorithm is represented by inaccurate measured function values at discrete, frequently enough, times. The proposed algorithm is based on two aspects: a local modification of the Tikhonov regularization method from the theory of ill-posed problems and the Krasovskii extremal shift method from the guaranteed control theory, both of which ensure the stability to informational noises and computational errors. Numerical experiments were carried out to illustrate the operation of the algorithm.

MSC:

26A33	Fractional derivatives and integrals
65D25	Numerical differentiation
34A08	Fractional ordinary differential equations

Keywords:

Caputo-type fractional derivative; reconstruction; incomplete information; error estimate; Mittag-Leffler type functions

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