nyquist plot

Does anyone here know of a freeware program that can generate Nyquist plots?
My Google efforts were not very helpful....
Thanks,
Bo
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Bo wrote:

SciLab.
It does a few other things, too.
--

Tim Wescott
Wescott Design Services
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Thanks Tim, I'm downloading now to check it out!
Bo
PS Thanks for your help last fall with my control homework question. It was a great class and in the end I managed to keep a 96 average--in part thanks to you. Now I'm in the follow-up class... time will tell if it will be as good and educational.+

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