Odd ODE15s behavior due to tspan argument
2 次查看(过去 30 天)
显示 更早的评论
Can anyone explain why ode15s results are sensitive to the tspan input? I thought the solver just interpolated between time points at the tspan argument pointz. But running the below (in 2017a) gives odd behaviour for me. Specifically, even at similar times the results are markedly different across each example.
% oscillating decaying function
% same function deltaT=0.01
[T1,Y1]=ode15s(@(t,x) -0.06*exp(-0.03*t)+0.2*cos(t),0:0.01:100,7);
% same function deltaT=1
[T2,Y2]=ode15s(@(t,x) -0.06*exp(-0.03*t)+0.2*cos(t),0:1:100,7);
% same function deltaT=10
[T3,Y3]=ode15s(@(t,x) -0.06*exp(-0.03*t)+0.2*cos(t),0:10:100,7);
% same function deltaT=10
[T4,Y4]=ode15s(@(t,x) -0.06*exp(-0.03*t)+0.2*cos(t),[0 100],7);
Tal=0:0.1:100;
t=0:1:100;
%analytical solution
y=5+2*exp(-0.03*t)+0.2*sin(t);
figure(gcf)
%compare all
plot(T1,Y1,T2,Y2,T3,Y3,T4,Y4,t,y)
legend({'DT=0.01','DT=1','DT=10','start and end','Analytical'})
xlabel('Time')
ylabel('Y')
figure(gcf)
回答(0 个)
另请参阅
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!