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)
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.
??
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