bode plot of 1/(s^0.5+1) or any other fractional order transfer function

 i am new to matlab how to plot frequency response of frational order systems

[Abdulsamad Engida]

How I can plot fractional order system in the sense of ABC by using Matlab?

Answer 1

[Shashank Prasanna]

I don't think this is possible with what ships with MATLAB (i may be wrong). But I found a FEX function that does what you ask:

http://www.mathworks.com/matlabcentral/fileexchange/3802-oustaloup-recursive-approximation-for-fractional-order-differentiators

[SAP]

You can refer the paper published by A. Charef for this.

This is a fractionl order tranfer function which can not be implemented directly.

It needs to be approximated first into a suitable higher integer ordered transfer fucntion which later can be impelemnetd in Matlab.

Answer 2

[Azzi Abdelmalek]

If H(s)= 4/(2s+1)

your_model=tf(4,[2 1])
bode(your_model)

[saswata]

power of s in this case is integer ,but i want fractional powers of s like s^0.5 or s^0.2

Answer 3

[AVINASH]

by using FOMCOM toolbox, you can easily find out the plot of fractional system