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有一学生成绩管理数据库如下表，要求建立一SAS数据集score，并输出显示 创建一个新的数据集class，新增平均成绩aver变量和等级考评grade变量，grade的值是根据aver值的大小给出A、B、C、D四个等级，并显示新数据集class(A student achievement management database as the table, called for the establishment of a SAS data set score, and output display create a new data set class, add an average score aver evaluation variables and grade level variables, grade values are based on the size of a aver value the A, B, C, D four grades, and displays the new data set of class)

一些有关fft 的东西，与大家共同欣赏。谢谢，大家的指正。(something about fft)

PROBABILITY for ELECTRICAL and COMPUTER ENGINEERS

说明：  观测器设计 对MATLAB学习帮助很大(Observer design study of great help MATLAB)

Fixed Point Implementation Basics, a practical usage guide.

Gaussian pyramidal model using Matlab

《MATLAB时尚百例实例》实例84-1()

program to simulate lyaponov method

用来计算rossler吸引子的程序，运用四阶龙格库塔法非常实用，(used to calculate rossler attractor procedures, using four-Runge- Kutta method is very practical.)

matlab中尝试修改坐标系的方法，采用极坐标(matlab try to modify the method of coordinate system, using polar coordinates)