Compute linear response characteristics
S = lsiminfo(y,t,yfinal)
S = lsiminfo(y,t)
S = lsiminfo(...,'SettlingTimeThreshold',ST)
S = lsiminfo(y,t,yfinal) takes the response data (t,y) and a steady-state value yfinal and returns a structure S containing the following performance indicators:
SettlingTime — Settling time
Min — Minimum value of Y
MinTime — Time at which the min value is reached
Max — Maximum value of Y
MaxTime — Time at which the max value is reached
For SISO responses, t and y are vectors with the same length NS. For responses with NY outputs, you can specify y as an NS-by-NY array and yfinal as a NY-by-1 array. lsiminfo then returns an NY-by-1 structure array S of performance metrics for each output channel.
S = lsiminfo(y,t) uses the last sample value of y as steady-state value yfinal. s = lsiminfo(y) assumes t = 1:NS.
S = lsiminfo(...,'SettlingTimeThreshold',ST) lets you specify the threshold ST used in the settling time calculation. The response has settled when the error |y(t) - yfinal| becomes smaller than a fraction ST of its peak value. The default value is ST=0.02 (2%).
Create a fourth order transfer function and ascertain the response characteristics.
sys = tf([1 -1],[1 2 3 4]); [y,t] = impulse(sys); s = lsiminfo(y,t,0) % final value is 0 s = SettlingTime: 22.8626 Min: -0.4270 MinTime: 2.0309 Max: 0.2845 MaxTime: 4.0619