id: 05642429 dt: j an: 05642429 au: Machado, J.A.Tenreiro ti: Calculation of fractional derivatives of noisy data with genetic algorithms. so: Nonlinear Dyn. 57, No. 1-2, 253-260 (2009). py: 2009 pu: Springer, Dordrecht la: EN cc: ut: fractional derivatives; fractional calculus; genetic algorithms; numerical differentiation ci: li: doi:10.1007/s11071-008-9436-1 ab: 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. rv: