what is step response in digital control system

what is the matlab code for finding step response in digital control systems?? show me some examples if possible

Answer 1

[Birdman]

One approach:

Gs=tf(1,[1 1 1]);%transfer function in s-domain(continuous)
Gz=c2d(Gs,0.001,'tustin');%system is digitized
%plotting step response of digital system
step(Gz)

By this way, we plot the step response of a digital system which is converted from continuous. Note that you will obtain different step responses for different sampling times(in this example it is 0.001) and transformation methods(in this example it is tustin). Observe the step responses by changing the sampling time.

Note that the more sampling time is smaller, the more it approaches to continuous response. See the difference by writing:

    Gs=tf(1,[1 1 1]);%transfer function in s-domain(continuous)
    step(Gs);hold on
    Gz=c2d(Gs,0.001,'tustin');%system is digitized
    %plotting step response of digital system
    step(Gz)

[princess]

I've seen in one document that it used "dstep" to plot the step response. is it possible

[Birdman]

I do not know about it. But this way is the best to do from command line.

By the way, if my solution solves your problem, can you accept it?