How do I set the 'RelTol','AbsTol'?

The following error occurs:

WARNING: Failed at t=3.120501e+01. At time t, the integration tolerance can only be satisfied by reducing the step size below the smallest allowed value (5.684342e-14). > On line ode15s (line 655)

I solved it with ODE15s.

Currently, these are 'RelTol' and 'AbsTol'.

opts = odeset('RelTol',1e-14,'AbsTol',1e-15)

How do I set the 'RelTol','AbsTol'?

Answer 1

[Cris LaPierre]

That is how you set the tolerances. You do need to include opts in your call to ode15s.

[t,y] = ode15s(odefun,tspan,y0,options)

The warning is telling you you need to increase your tolerances in order to solve the integration at that time.