You should be able to produce a table of roots of the numerator and the
denominator using ratnumer and ratdenom and allroots. The I think dataplot
will do the rest of the job. Whether it is simple or not depends on how easy
it is to figure out the details :)
If you are interested in doing arithmetic directly on pole-zero expressions,
see http://www.cs.berkeley.edu/~fateman/papers/poles.pdf . I would be
delighted to find there was a good application.
> -----Original Message-----
> From: maxima-bounces at math.utexas.edu [mailto:maxima-
> bounces at math.utexas.edu] On Behalf Of Hugo Coolens
> Sent: Saturday, December 02, 2006 6:39 AM
> To: maxima at math.utexas.edu
> Subject: newbie plotting pole-zero diagrams
>
> Does a simple method exist to make Maxima display a so called "pole-zero
> diagram"?
> If I have for example a transfer function H(s) = (1+3*s)/(1+3*s+s^2)
> I'd like Maxima to plot the symbol "o" in the complex plane at (-1/3,0)
> and a symbol "x" for the complex roots of the denominator.
>
> regards,
> hugo
>
> _______________________________________________
> Maxima mailing list
> Maxima at math.utexas.edu
> http://www.math.utexas.edu/mailman/listinfo/maxima