[SciPy-dev] bug in signal.lsim2

Ryan Krauss ryanlists@gmail....
Thu Jan 28 14:38:47 CST 2010


(sorry, I meant to send this to the user list.  But feel free to reply.)

On Thu, Jan 28, 2010 at 2:38 PM, Ryan Krauss <ryanlists@gmail.com> wrote:
> I believe I have discovered a bug in signal.lsim2.  I believe the
> short attached script illustrates the problem.  I was trying to
> predict the response of a transfer function with a pure integrator:
>
>              g
> G = -------------
>          s(s+p)
>
> to a finite width pulse.  lsim2 seems to handle the step response just
> fine, but says that the pulse response is exactly 0.0 for the entire
> time of the simulation.  Obviously, this isn't the right answer.
>
> I am running scipy 0.7.0 and numpy 1.2.1 on Ubuntu 9.04, but I also
> have the same problem on Windows running 0.7.1 and 1.4.0.
>
> Thanks,
>
> Ryan
>


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