MATLAB: How to Plot the stepsize

plot the stepsize

Hello,
I have an ODE System and I want to solve it with ode45(). Now ode45() has a dynamical step size. BUT how can I plot the stepsize within my time intervall? I want to see in which time my step size increases or decreases.
Thank you very much for your help.

Best Answer

The ODE solvers return a [N x 2] matrix [t x]. To get an idea of how your step size changes, I suggest:
x = 0:length(t)-1;
stepsize = diff([0; t]);
plot(x, stepsize)
grid
Alternatively to plot stepsize as a function of the integration times:
plot(t, stepsize)
grid
Is this what you want to do?
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