The max span is 0..10 Else attempt gives either two types of error.
The setup is correct but the result is a bit short of production.
Designers: that is just a report for your bed time thinking.

Cheers, Jean

ODE Rkadapt HIRES.sm (562 KiB) downloaded 37 time(s).

Hello Jean,

Why don't you use stiff solvers, for example from DotNumerics plugin. They will cope with this equations well (dn_AdamsMoulton, dn_ExplicitRK45, dn_GearsBDF..).



Regards,
Radovan

P.S. By the way, uni made many ode solvers in few plugins, and I think SMath is very good regarding ODE solvers

Thanks Radovan,

Here is well done, Jean

ODE HIRES.sm (41 KiB) downloaded 40 time(s).