Re: How to solve a stiff ODE system?

Orlando wrote:
d Y
---- = f(t, Y), Y(t_0) = Y_0
d t
Warning: Failure at t=1.533227e-003. Unable to meet integration
tolerances without reducing the step size below the smallest value
allowed (5.447117e-018) at time t.

Suspect stiffness is not a problem,cannot say further as you do not
indicate f(t,Y).For eps =10^-8, if initial condition Y(t_eps) = Y_0 is
used and ode behaves well, then problem was with usage of first order
equation.To fix such cases switch over to a second order differential
equation providing two initial conditions.

.

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