How to find rise time in fractional order system, give matlab code?

The stepinfo function having error for fractional order system and any one please share the code for the below mentioned system

(s^1.2+2s+3)/(s^3+5s^1.5+2s^0.9+6)

[SARAVANAN]

hi sam chak ,

got the output , thaks lot

Answer 1

[Sam Chak]

Hi @SARAVANAN

Once you have generated the response signals y(t) from the fractional order system, use the following syntax to determine the step-response characteristics:

S   = stepinfo(y, t, yfinal, yinit)

where t is the time vector, yfinal is the steady-state value of the response, and yinit is the initial value before the step is applied.