[SciPy-user] Small problem with scipy.signal
Stefan van der Walt
stefan at sun.ac.za
Tue Dec 11 17:41:17 EST 2007
Hi Clovis
On Tue, Dec 11, 2007 at 05:09:34PM -0200, Clovis Goldemberg wrote:
> I am having some problems with scipy.signal
> (specifically with scipy.signal.step) which can be
> explained by the following text,
> which was edited with some comments.
> Configuration is also given in the text.
[...]
> >>> num=[1.0]
> >>> den=[1.0,0.0]
> >>> ss.step((num,den))
> #####################################
> # This fails!
> # The transfer function would be "1/s"
> # which is a simple integrator.
> #####################################
Looks like the system is converted to state space. After that,
somewhere along the line A is inverted, which causes the problem. I
think a person can get away with only inverting [I-A], but I'll have
to poke around the source a bit to be sure.
Regards
Stéfan
More information about the SciPy-User
mailing list