How to set risetime thresholds in stepinfo function

Hi there,

i am measuing the performance of a control system and using the function 'stepinfo' to do so. On the documentation, it says that the default threshold for the risetime is 10%-90%, but it can be changed. I have tried many different ways and cant find out actually how to change these values. i am trying to set them from 0%-100% which the documentation says is possible.

Any ideas?

Answer 1

[Star Strider]

Try something like this —

sys = tf([1 5 5],[1 1.65 5 6.5 2]);
step(sys)

si = stepinfo(sys, 'RiseTimeThreshold',[0 1])

si = struct with fields:
         RiseTime: 4.8143
    TransientTime: 27.9762
     SettlingTime: 27.9762
      SettlingMin: 2.0689
      SettlingMax: 2.6873
        Overshoot: 7.4915
       Undershoot: 0
             Peak: 2.6873
         PeakTime: 8.0530

This is illustrated in the documentation, however not well documented in the Input Argmuments section.

.

[Elvis Lee]

thanks, that works great :)

[Star Strider]

As always, my pleasure!