优化算法-增广乘子法C语言算法，含约束，亲测可通过-Optimization algorithm- augmented multiplier method C language algorithms

约束优化算法：拉格朗日乘子法matlab程序-Constrained optimization algorithm: the Lagrange multiplier method and matlab program

用平面波展开法计算二维声子晶体带隙,有循环检测，周期性检测，利用最小二乘算法实现对三维平面的拟合。- Computation Method D phononic bandgap plane wave, There are cycle detection, periodic testing, Least-squares algorithm to fit a three-dimensional plane.