How to set the step size signal using step command?

I am trying to invoke a step signal to my State space equation but the step value is unity. I want to inject a value around 91 to my state space model using the "step" command. Thanks in advance!

Answer 1

[Star Strider]

The step function only delivers unit amplitudes.

One option would be to cascade an ‘amplifier’ with your system.

Example —

a = [-0.5572,-0.7814;0.7814,0];
b = [1,-1;0,2];
c = [1.9691,6.4493];
sys = ss(a,b,c,0);
[y1, t1] = step(sys);

a = [-0.5572,-0.7814;0.7814,0];
b = [1,-1;0,2] * 91;
c = [1.9691,6.4493];
sys = ss(a,b,c,0);
[y2, t2] = step(sys);

figure(1)
subplot(2,1,1)
plot(t1, squeeze(y1))
title('Original')
grid
subplot(2,1,2)
plot(t2, squeeze(y2))
title('Amplified')
grid

[Mr. NailGuy]

I see, I was actually able to figure it out now. There is command that changes the step function amplitude :)

[Star Strider]

You can access and specify the stepDataOptions structure and set the StepAmplitude field to be whatever you want. I do not remember when this was introduced, and since many here have older MATLAB releases, I did not mention it.

[Mr. NailGuy]

Yeah, I am using a latest version so I have his command :) Thanks

[Star Strider]

As always, my pleasure.