Dear Math Gurus,

I have a two coupled ODE's with a periodicity condition that makes it bounded. I have only dealt with single ODE's and partial ODE's which solve a coefficient matrix with either 5-point method or some other.

How do I solve a system of BVP's? I have attempted using Matlabs bvp4c but it gives unstable solutions.

Can anybody guide me towards some literature please or give a scheme as I can find none?