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

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채원 이
채원 이 2022-1-3
回答： Cris LaPierre 2022-1-3
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'?

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回答（1 个）

Cris LaPierre
Cris LaPierre 2022-1-3
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.

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