Here is an simple example:
I define an ode45 function and call it :
Function code
After running it, we can see that Only state variables of the function can be stored in the workspace and other intermediate cannot stored in the workspace.
Besides, the definition of ODE function only return state variables, which is different from other matlab functions that we can define your own output variables. If I want to make intermediate variables q_d and e_q can be also stored in the workspace in the form of an array “901x2”double, as same as the form of state variables. How can I do to achieve it.
Hi, you need to use an ode solver with dense output. You simply have to define a function that is computed at each integration step and that stores outputs on a file. For example dopri853 solver allows dense output. Which ode45 are you using? Matlab, Fortran, ...
Hi, to use the dense output with MATLAB ode45 you must define an option as follows:
options = odeset('OutputFcn',@myfun) that sets 'OutputFcn' to @myfun,
a handle to the function myfun.
The output function must be of the form:
status = myfun(t,y,flag)
yoy can refer to the help page of MATLAB for more details
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