ode solver , restart from where the simulation ended

Hi,

I am using ode solver to simulate a system of differential equations.

tspan = 0:0.0001:1

[t s] = ode15s(@(t,s) fun(t,s), tspan , s0 ,options);

I ran for the tspan that is defined and obtained the results (0 to 1 second). I want to restart the simulation from where it ended and run for 2 seconds instead of rerunning the whole simulation again.

Any suggestions?

Thanks

Answer 1

[Bjorn Gustavsson]

Just extract the solution at 1 s from s (i.e. the last row in s). Then simly run the integration from there:

t2 = linspace(1,3,2001); % or what resoution you need
s0_2 = s(end,:); % 
[t1to3 s1to3]  = ode15s(@(t,s) fun(t,s), t2 , s0_2 ,options);

That should be enough.

HTH