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From: Ha on 16 Apr 2010 08:43

[b,a] = zp2tf(z,p) yields the transfer function polynomial coefficients from the zero-pole points. My question is, what is the unit of z and p? Hz or rad/s?
From: Mark Proulx on 16 Apr 2010 15:59
"Ha " <scifiles(a)126.com> wrote in message <hq9m0s$386$1(a)fred.mathworks.com>...
>
> [b,a] = zp2tf(z,p) yields the transfer function polynomial coefficients from the zero-pole points. My question is, what is the unit of z and p? Hz or rad/s?

The units are rad/s.
From: Mark Proulx on 17 Apr 2010 19:20
"Mark Proulx" <mark.p.proulx(a)boeing.com> wrote in message <hqafio$dj9$1(a)fred.mathworks.com>...
> "Ha " <scifiles(a)126.com> wrote in message <hq9m0s$386$1(a)fred.mathworks.com>...
> >
> > [b,a] = zp2tf(z,p) yields the transfer function polynomial coefficients from the zero-pole points. My question is, what is the unit of z and p? Hz or rad/s?
>
> The units are rad/s.

I should have added "for the analog case" to my reply. In the digital realm, the units are rad/sample.

Look in the Matlab "doc" under "Signal Processing Tool Box --> Technical Conventions"
From: Ha on 19 Apr 2010 01:51
"Mark Proulx" <mark.p.proulx(a)boeing.com> wrote in message <hqdfn9$mb7$1(a)fred.mathworks.com>...
> "Mark Proulx" <mark.p.proulx(a)boeing.com> wrote in message <hqafio$dj9$1(a)fred.mathworks.com>...
> > "Ha " <scifiles(a)126.com> wrote in message <hq9m0s$386$1(a)fred.mathworks.com>...
> > >
> > > [b,a] = zp2tf(z,p) yields the transfer function polynomial coefficients from the zero-pole points. My question is, what is the unit of z and p? Hz or rad/s?
> >
> > The units are rad/s.
>
> I should have added "for the analog case" to my reply. In the digital realm, the units are rad/sample.
>
> Look in the Matlab "doc" under "Signal Processing Tool Box --> Technical Conventions"

Thx.
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