Stefan van der Walt
stefan at sun.ac.za
Sat Sep 9 02:30:42 CDT 2006
On Fri, Sep 08, 2006 at 07:12:35PM -0600, Travis Oliphant wrote:
> Ryan Krauss wrote:
> >I am having a rough time trying to use the lti portion of
> >scipy.signal. For starters, I just wanted to generate a step response
> >for an integrator (1/s).
> It turns out your starting-point is a special-case not handled by the
> current code (I checked this on old SciPy and it raised errors as
> well). The current code is "general-purpose" but does not handle
> lonely integrators. Thus, any time your denominator ends in a zero, you
> will have trouble. This case needs to be dealt with separately but so
> far isn't (the error could be more informative of course). You would be
> better of trying a simple first-order system as your starting point.
Interestingly, he didn't get the
IndexError: index out of bounds
that I see, but rather
TypeError: array cannot be safely cast to required type
which is what lead me to ask about the 64-bit platform. Same problem?
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