Ex_3_4

Steganography LSB by 3bits find and hide information in a image

说明：  用四阶经典龙格库塔算法求解5阶细胞神经网络状态方程，得到5路超混沌序列。(With the fourth order classical Runge-Kutta algorithm for 5-order cellular neural network state equation, 5-way super-chaotic sequence are generated.)

MatLab Commands as a Reference for the Use of Communication

在科研中，大量时间花在统计年鉴的搜集上，例如找《中国城市统计年鉴》中2000多个市，要对分散的八个城市群找对应的数据，如果每次筛选会花费大量时间，如果做好excel表头，把对应的城市写上去会在多个文件多个工作组查找满足要求的数据，直接按需要保存成excel，进行后续分析。(In the research, the amount of time spent on the Statistical Yearbook of the collection, for example, to find " China City Statistical Yearbook" in more than 2000 cities and want to find a group of eight cities scattered corresponding data, if each screening will spend a lot of time, If you do excel header, the corresponding write up the city will look to meet the requirements of data in multiple files multiple workgroups, saved directly as needed to excel, for subsequent analysis.)

双线性变换法设计Butterworth滤波器。分别画出滤波前和滤波后的时域图和频谱图。(Bilinear transform design Butterworth filter. Draw the pre-filter and the filtered time-domain and frequency spectrum.)

比较QR分解算法与迫零算法的误码率，支持BPSK调制和QPSK调制，天线数量可以选择(Compare QR decomposition algorithm and zero forcing algorithm BER)

基于Matlab的PCA人脸识别算法，代码注释清楚，实现简单。(PCA face recognition algorithm based on Matlab)

说明：  《精通MTLAB最优化计算》第7章 无约束多维极值问题 源码(&quot The most proficient MTLAB Optimization&quot Chapter 7 source for unconstrained multi-dimensional extremum problems)

character recognition by a neural network, implementation done on matlab

MATLAB CODE TO SOLVE EQUATIONS Ax=b