how i discretize linear differential equations(2 or 3 order)

Hi,

i have a ode23 result ad i must change it

for ex:i have result od ode23 func. and i want to have

x[j] j=0,1,....N (jT/N) T:time interval

so how can i do it in matlab

Thanks for your help....

Answer 1

[Bård Skaflestad]

I think your question is poorly posed. Do you call the ODE solver using a syntax such as the following

[t, y] = ode23(odefun, tspan, y0)

whence ode23 returns a time point vector t that is not linearly spaced but you want them to be -- i.e., such that

all(diff(t)==t(2)-t(1))

In that case I recommend you read the documentation for ode23 more carefully. It is clearly documented how to do this. See either of

doc ode23

or

help ode23