how to select function output in ode solver

Hi everyone,

I have a function that returns a (3xN ) matrix in which each column corresponds to three coupled differential equations which i want to solve using an ode solver, how do i extract each column of the output of the function separately so I can run N ode solvers to solve each of the equations? Ive tried the below where g is my function and ret is the (3xN) output matrix from the function g?

for j=1:N
  [t,x] = ode45(@g((ret(1,N),ret(2,N),ret(3,N))),tspan,x0); 
end

thanks