余向阳博士Matlab教程的源代码。 包括：1.非线性方程的解法；2.线性方程的数值解法；3插值法；4.常微分方程的解法-Dr. Yu Xiangyang Tutorial Matlab source code. Include: 1. Non-linear equations 2. The numerical solution of linear equations 3 interpolation 4. The solution of ordinary differential eq