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上海交通大学最优化练习题2，复习考试必备习题(Shanghai Jiaotong University, 2 optimization exercises, review exercises necessary tests)

本代码的功能是使用BP神经网络对蝴蝶花进行分类(The functionality of the code is to use the BP neural network to classify the butterfly flower)

纯色光的杨氏双缝干涉的Matlab仿真实验，与大学物理上的实验一致，可以看到干涉条纹(Solid y ou n g s s double slit interference of light, the simulation experiment, on the pure visiable light)

说明：  FDTD方法，在MATLAB中模拟二维空间中点源振动所发出的波的传播(FDTD method for simulating two-dimensional space in the mid-point MATLAB source of vibration wave propagation given by)

file about matlab: simulink

采用小波变化来完成数字水印的加密和解密，并且加入了猫脸变换(Wavelet change digital the watermark encryption and decryption, and cat face transform.)

MATLAB命令大全。可以帮助广大初学者学习使用matlab。(MATLAB command Daquan. Can help the beginners to learn how to use matlab)

This is the cosde for shortest path algorithm

matlab对一幅图像，采用半径值为20、80、200的截止频率进行理想低通滤波，观察其结果。要求给出原图像及相应的付利叶频谱图和滤波结果(For an image, using the radius value of the cutoff frequency 20,80,200 ideal low-pass filter to observe the results. Required to give the original image and the corresponding Fourier spectrum and filtering results)

运用灰色理论来预测未来的数据,将其中的数据用你的一列数据替换，再在matlab 中运行即可。(use grey theory to Predict the future data.)