% Filename: ora_foc.m
% Oustaloup-Recursive-Approximation for fractional order differentiator
% Input variables:
% r: the fractional order as in s^r, r is a real number
% N: order of the finite TF approximation for both (num/den)
% (Note: 2N+1 recursive z-p pairs)
% w_L: low frequency limit of the range of the frequency of interest
% w_H: upper freq. limit of the range of the frequency of interest
% sys_foc: continuous time transfer function system object (TF)
%  Oustaloup, A.; Levron, F.; Mathieu, B.; Nanot, F.M.; "Frequency-band
% complex noninteger differentiator: characterization and synthesis".
% EEE Transactions on Circuits and Systems I: Fundamental Theory and
% Applications, I , Volume: 47 Issue: 1, Jan. 2000, Page(s): 25 -39
%  D. Xue, Y.Q. Chen and D. Atherton. "Linear feedback control -
% analysis and design with Matlab 6.5". Textbook draft. Chapter 9
% "Fractional order control - An introduction". PDF available upon
% request. Send request email to "email@example.com".
For more information on FOC, check my FOC web http://mechatronics.ece.usu.edu/foc/
your function helped me alot
Hi I put the pdf file for ref.  here: http://mechatronics.ucmerced.edu/sites/mechatronics.ucmerced.edu/files/page/documents/linear_feedback_control_-_analysis_and_design_with_matlab-chap08.pdf
Welcome to visit my AFC page
Very well explain
I am interested any documents of Fractional Calculus, fractional Order Controler, ...