Negative Values in Step Response

2013 5 26
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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?

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Azzi Abdelmalek
Azzi Abdelmalek 2013-5-26

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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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