Solving ICs starting at non-zero point

Solving 2nd order ODE with ICs located at non-zero points using several ways

This script demonstrates how to solve IVP of 2nd order ODE with ICs at non-zero points by using Symbolic MATH "dsolve", and ODE45, Simulink and via scripts
based on Runge-Kutta methods.
NOTE: two files ICs_at_NON_zero.m file and ICs_at_NON_zero_.mdl files need to be put in the same directory to execute both models from ICs_at_NON_zero.m.
NOTE: ICs_at_NON_zero_.mdl has two version models included one for older (for MATLAB2010b or older versions) and newer (for MATLAB2012a)