Asked by Kenneth
on 26 May 2013

Hi guys,

I just noticed something interesting on MATLAB.

I was working with a transfer function, and I inserted a delay using a Pade approximation, and plotted the step response. At first glance, it seems just like any other step response, however when i zoomed in on the origin, I noticed that it slightly dips into negative values before coming up.

I've never noticed this before. Anyone have any idea why it does this?

Answer by Azzi Abdelmalek
on 26 May 2013

Accepted answer

This is normal, when your transfer function contains positives zeros

example H(p)=(-p+2)/(p^2+2p+1)

step([-1 2],[1 2 1])

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