Actually I am working on a programming project to simulate some physical systems. And I happen need to know the solution of this ODE in order to compute the values to simulate the system. I would like to put the focus on the programming side rather than solving the ODE, that's why I would resort to those math softwares. What a shame that I've not got any knwoledege about using them. Luckily that you nice gentleman help me much! Thank you!