[SciPy-User] Problems with dopri45

Warren Weckesser warren.weckesser@enthought....
Tue Apr 3 07:42:40 CDT 2012

On Tue, Apr 3, 2012 at 5:54 AM, L. Barrott <lb489@cam.ac.uk> wrote:

> Hello,
> I have been trying to get scipy to solve a set of coupled odes and in
> particular I want to use the dopri 45 method as I want to compare the
> results to the ode45 method in MATLAB. The code runs along the lines of:
> def func (t, Y, params):
>    ...
>    return (Ydot)
> with Y a vector. The other ode methods (except dop853 of course) solve this
> fine but even if I use the example code on the documentation page the dopri
> method returns the following error
> create_cb_arglist: Failed to build argument list (siz) with enough
> arguments (tot-opt) required by user-supplied function (siz,tot,opt=2,3,0).
> ...(traceback stuff) _dop.error: failed in processing argument list for
> call-back fcn.
> Any ideas where I am going wrong?
> Many thanks
> LB

It would help to see more of your code.  Could you include a complete,
self-contained script that demonstrates the error?

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