Weird response to a step in matlab

[transfercs]

I have this script which isn't making that much sense.

clear all
kp = 0.000065;
ki = 0;
kd = 0;
b = pid(kp,ki,kd);
d = (tf([1 0],[1]))
f = tf([11.53 1.068],[1 0.09834 6.263*10^(-5)])
velocity = feedback(b*f,d)
a = pole(velocity)
b = zero(velocity)
step(velocity)

Looking at it's step input, you will see that the final value is incredible large considering that response is due to a step input.. i know something must be wrong but what is wrong?

 

[IRstuff]

Is this for school? Student posting is not allowed.

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

 

[transfercs]

Nope.. i am testing a controller for a system, it doesn't reponds as i want it to.. that why i asking if I am doing something wrong.

 

[GregLocock]

random script produces random result. My telepathy circuit is obviously broken.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[IRstuff]

So, who wrote the script? Why not ask them?

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

 

[SomptingGuy]

Looks to me like basic misunderstanding of some of the lesser travelled bits of Matlab: some of the longer, cleverer functions in the control system toolbox (which use names that IMO should be decorated, not simple). This little example explains nothing but shows what to do (i.e. how to create the right arguments to pass from one "function" to the next).

http://www.mathworks.co.uk/help/control/examples/plotting-system-responses.html

- Steve