都是matlab中经典的函数与方程代码，如埃特金插值，复合求积公式，用欧拉法求一阶常微分方程的数值解，龙格库塔法等-All matlab functions and equations of classical code, such as Aitken interpolation, composite quadrature formula, the first-order Euler method for the numerical solution of ordinary differenti

微分求积法，只需修改边界条件即可，方便实用-Differential quadrature method, simply modify the boundary conditions can be convenient and practical

基于微分求积法分析转速，粘弹比，细长比等参数对固有频率的影响(The influence of rotational speed and other parameters on natural frequencies is analyzed.)