UMAT beginning

This FDTD 2D simulation based on Dennis Sullivan book s. Wave propagation in vacuum background using PML boundary conditions.

说明：  ADAM （Adaptive Moment Estimation）是另外一种自适应学习率算法，它结合动量梯度 下降法，在不同参数方向上采用不同学习率，保留前几次迭代的梯度，能够很好 的适应于稀疏数据。(ADAM (Adaptive Moment Estimation) is another adaptive learning rate algorithm, which combines momentum gradient. The descent method, which uses different learning rates in different parameter directions and retains the gradients of previous iterations, is very good. It is suitable for sparse data.)

Matlab计算生成双脊波导截止频率的源程序(Matlab calculation to generate double-ridged waveguide cut-off frequency of the source)

平面应力、平面应变有限元数值计算,适合于有限元编程入门(plane stress and plane strain for numerical calcualtion)

说明：  基于MATLAB蚁群算法LF解决聚类问题源程序代码，包括文档与论文(MATLAB-based ant colony algorithm to solve clustering problem LF source code, including documents and papers)

说明：  在雷达上应用卡尔曼滤波算法对目标轨迹进行预测(The application of the radar Kalman filter algorithm to predict the target trajectory)

统计[0, 100] 之间的学生人数并且求出最值和均值(Statistics [100], the number of students and find the best value and the mean)

J2流动理论加上破坏失效判据的程序，用于ABAQUS中的vumat程序，功能模拟加载到失效破坏的过程(J2 flow theory coupled with damage failure criteria of the program for the vumat ABAQUS program, functional simulation load to failure of the process of destruction)

多目标粒子群优化算法，利用粒子群算法原理编写优化两个目标函数。(Multi-objective particle swarm optimization algorithms, particle swarm optimization principle to write to optimize the two objective functions.)

重力异常正演代码，请好好使用它。帮助学习。。。。(Gravity anomaly forward code, please use it well. Help learn)