Generating a vector for ode45

Hi, somewhat new to matlab my problem is:

I've been trying to make a code to solve the following set of odes:

for r where we can choose N and , and we are given .

I'm not sure of how to make a vector containing each of these ode's as elements of the vector so I can put it into ode45.

Many Thanks!

[Walter Roberson]

That looks like something that could be expressed in matrix form.