[SciPy-User] Ticket #1187: ode crashes if rhs returns a tuple instead of a list

Tony Yu tsyu80@gmail....
Thu Nov 10 09:05:48 CST 2011

On Thu, Nov 10, 2011 at 9:39 AM, Bruce Southey <bsouthey@gmail.com> wrote:

> **
> On 11/09/2011 04:02 PM, Tony Yu wrote:
> I just want to draw attention to the bug report in
> http://projects.scipy.org/scipy/ticket/1187. Basically,
> scipy.integrate.ode takes a function as input, and the error occurs if that
> function returns a tuple (instead of, e.g., a list).
> If there isn't a simple fix (I can't tell b/c the error occurs within
> C-code, which I'm not at all proficient in), then I think this should print
> a more informative error message.
> Best,
> -Tony
> _______________________________________________
> SciPy-User mailing listSciPy-User@scipy.orghttp://mail.scipy.org/mailman/listinfo/scipy-user
>  Ah
> Now I understand, perhaps providing the actual code to the ticket would
> avoid confusion.
> Here you are replacing a mutable object with an immutable object so that
> may be an issue.

I was thinking the same; for example, if the input function returns an
array it also works fine. I'm not sure whether the correct behavior is to
simply cast the tuple to a list or to simply raise a more informative
error. Unfortunately, I don't understand the C-code well enough to submit a

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