is it possible to change step size of "ode45" ?

hi

I was wondering can I change step size of "ode45"? If I am not wrong, the default step size taken by Matlab is 1. I want to make 1/2. how can I change without changing many things in Matlab code. If I assign an "option", is that enough? any other options?

thanks

[Jan]

No, the default step size of ODE45 is not 1. There is not even a default step size. See Torsten's answer: The step size is controlled such, that the provided tolerances are kept.

With using a vector as tspan, you can define the steps in the output, but this is not the internally used step size.

Answer 1

[Torsten]

The stepsize of ode45 is not constant, but chosen such that the error tolerances you prescribe are met. Thus mean step size can only be controlled indirectly by strengthening (-> smaller stepsize) or weakening (-> larger stepsize) the error tolerances RelTol and AbsTol.

Or do you mean changing the time instants when MATLAB supplies the solution ?