Root locus plots

[Michel]

Hi,

I wonder if it is possible to do root locus plots in sage?

The root locus plot of a complex function is basically the zero locus
of the imaginary part but it should be equipped
with various markings.

Regards,
Michel

[Vasudev]

if this is possible .. some of my control theory friends will jump into sage  ....

is it there?

as far as i know there isn't a direct function for it

regards ...

Vasu

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[kcrisman]

>
> On Sun, Apr 10, 2011 at 7:24 PM, Michel <vdbe...@gmail.com> wrote:
> > Hi,
>
> > I wonder if it is possible to do root locus plots in sage?
>
> > The root locus plot of a complex function is basically the zero locus
> > of the imaginary part but it should be equipped
> > with various markings.

Can you give a web link to an explanation of a toy example? The
Wikipedia article was less than helpful (and indeed is marked for
cleanup), and other resources I found were better, but didn't quite
explain a precise mathematical definition.

Certainly it looks like it could be a matter of plotting an implicit
plot of the zeros of the function in the complex plane, and adding
special points at these open and closed points; there is no reason it
couldn't be done, and added as a module if people liked it.

- kcrisman