On Mon, Nov 17, 2025 at 3:45 AM [email protected] <[email protected]>
wrote:
> According to the manual the following should work:
>
> t,y=var('t,y');
> g= lambda t,y:-y/(2*y^3 - 1);
> ra = ode_solver();
> ra.function=g;
> ra.ode_solve(y_0=1,t_span=[0,1],num_points=100)
>
Please write the ODE you want to solve, in the usual maths notation -
it's not clear what it is.
>
> However, I get the error message
>
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call last)
> /tmp/ipykernel_317/557462051.py in <module> ----> 1 ra.ode_solve(y_0=
> Integer(1),t_span=[Integer(0),Integer(1)],num_points=Integer(100))
> /usr/lib/python3/dist-packages/sage/calculus/ode.pyx in
> sage.calculus.ode.ode_solver.ode_solve
> (build/cythonized/sage/calculus/ode.c:5124)() 412 self.y_0 = y_0 413 -->
> 414 dim = len(self.y_0) 415 type = isinstance(self.function,ode_system)
> 416 if type == 0: TypeError: object of type 'sage.rings.integer.Integer'
> has no len()
>
> Also
> def f(t,y): return -y/(2*y^3 - 1);
> ra.function=f;
>
> gives the same error.
>
> ??
>
> --
> You received this message because you are subscribed to the Google Groups
> "sage-support" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected].
> To view this discussion visit
> https://groups.google.com/d/msgid/sage-support/d14332f8-44b6-4f93-9b42-0972926d2a16n%40googlegroups.com
> <https://groups.google.com/d/msgid/sage-support/d14332f8-44b6-4f93-9b42-0972926d2a16n%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
--
You received this message because you are subscribed to the Google Groups
"sage-support" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion visit
https://groups.google.com/d/msgid/sage-support/CAAWYfq20u6BvkMpw7VMoPsJ2T-YaL74HfnrWEmEYF%2BzHugQVog%40mail.gmail.com.
