\input zb-basic \input zb-ioport \iteman{io-port 05642429} \itemau{Machado, J.A.Tenreiro} \itemti{Calculation of fractional derivatives of noisy data with genetic algorithms.} \itemso{Nonlinear Dyn. 57, No. 1-2, 253-260 (2009).} \itemab Summary: This paper addresses the calculation of derivatives of fractional order for non-smooth data. The noise is avoided by adopting an optimization formulation using genetic algorithms (GA). Given the flexibility of the evolutionary schemes, a hierarchical GA composed by a series of two GAs, each one with a distinct fitness function, is established. \itemrv{~} \itemcc{} \itemut{fractional derivatives; fractional calculus; genetic algorithms; numerical differentiation} \itemli{doi:10.1007/s11071-008-9436-1} \end