How do I write the transferfunksjon in Matlab

Hi!

How do I write the transfer function:

100000/((s/100 + 1)*(s/100000 + 1))

Thanks for answers.

Answer 1

[Sebastian Castro]

If you have Control Systems Toolbox, the tf (transfer function) or zpk (zero-pole-gain) functions will be very helpful. Since your transfer function is already factored, it looks like zpk is the way to go.

We know

• There are no zeros
• The poles are -100 and -100000
• The gain is 100000

So,

>> sys = zpk([],[100 100000],100000)

That's it!

- Sebastian

[Remi Vassnes]

Thanks a lot for your answer :) But if I want to use the num and den code, what would I den use for den before I use G= tf(num, den)?

[Sebastian Castro]

You can also build it from scratch using 's' as follows:

s = tf('s');
num = 100000;
den = ((s/100)+1)*((s/100000)+1)
sys = num/den

- Sebastian