Step Response of a Fractional Order System from Frequency Data

This code finds the step response of a fractional order system from frequency domain data

Step Response of a Fractional Order System from Frequency Data
Selman Fatih Avsar and Serdar Ethem Hamamci
([e-mail] and [e-mail])
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This m-file computes and draws the unit step response of a fractional order system. To achieve this, an approximation method which is based on using of frequency data of the system is used. The frequency response of the system is considered as a set of piecewise linear parts.
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The method uses the results of Levadi's forgotten work (Levadi, V.S., “Simplified Method of Determining Transient Response From Frequency Response of Linear Networks and Systems”, IRE Trans. on Automatic Control, 4(2):55-66, 1959.)
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see our paper: S.F. Avsar and S.E. Hamamci, "Obtaining of Time Response from Frequency Response of Fractional Order Systems", (SIU 2015) 23th IEEE Signal Processing and Communications Applications, Malatya, Turkey (will be seen in IEEExplore soon)....