natlab21

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)

说明：  matlab经典教材，详细讲述了matlab6.0的功能与使用方法(matlab classic materials, matlab6.0 described in detail the function and use)

这是模式识别中最小错误率Bayes分类器设计方案。 自行完善了在不同先验概率的条件下，男、女错误率和总错误率的统计，放入各个数组当中。 全部程序由主函数、最大似然估计求取概率密度子函数、最小错误率贝叶斯分类器决策子函数三块组成。 调用最大似然估计求取概率密度子函数时，第一步获取样本数据，存储为矩阵；第二步对矩阵的每一行求和，并除以样本总数N，得到平均值向量；第三步是应用公式（3-43）采用矩阵运算和循环控制语句，求得协方差矩阵；第四步通过协方差矩阵求得方差和相关系数，从而得到概率密度函数。 调用最小错误率贝叶斯分类器决策子函数时，根据先验概率数组，通过比较概率大小判断一个体重身高二维向量代表的人是男是女。 主函数第一步打开“MAIL.TXT”和“FEMALE.TXT”文件，并调用最大似然估计求取概率密度子函数，对分类器进行训练。第二步打开“test2.txt”，调用最小错误率贝叶斯分类器决策子函数，然后再将数组中逐一与已知性别的数据比较，就可以得到不同先验概率条件下错误率的统计。 (This is the minimum error rate pattern recognition Bayes classifier design. Self- improvement prior probability in different conditions , male , female and total error rate error rate statistics , into which each array . All programs from the main function , maximum likelihood estimation subroutine strike probability density , the minimum error rate Bayesian classifier composed of decision-making three subfunctions . Strike called maximum likelihood estimate probability density subroutine , the first step to obtain the sample data , stored as a matrix the second step of the matrix, each row sum , and divided by the total number of samples N, be the average vector third step is to application of the formula ( 3-43 ) using matrix and loop control statements , obtain the covariance matrix fourth step through the variance-covariance matrix and correlation coefficient obtained , resulting in the probability density function . Call the minimum error rate decision Functions Bayesian)

利用matlab编写的桁架结构模态振型计算，运行之后出现各阶振型动画。 (Prepared using matlab truss calculation of vibration mode, run the first vibration mode appears after the animation.)

螺旋锥齿轮小轮右旋右侧齿面数控加工关键点计算，包括对刀点、回转工作台旋转角度等(Spiral bevel gear small round right-handed right side of the tooth surface CNC machining critical point calculations, including the knife point , the rotary table rotation angle )

SG滤波，用于时间序列数据的平滑处理，内容有待完善(SG filtering for smoothing time series data, content needs to be improved)

SiC衬底X波段GaNMMIC的研究博士论文(SiC substrate X-band study GaNMMIC doctor thesis)

用线性外推实现语音修复,得到更好特性的语音效果(realize the bandlimited signal to wideband by linear extrapolation)

OFDM中的关于交织器的个人设计的MATLAB的算法，比较经典的 ！(OFDM on the intertwined with the personal design of MATLAB algorithm, more classic!)

Calculate CINR in physical layer in MATLAB. clc clear all close all N = 1 R = 10 D = sqrt(3*N)*R angleValue = [pi/6 (3*pi)/6 (5*pi)/6 (7*pi)/6 (9*pi)/6 (11*pi)/6] c = 3*10^8 carrierFreq = 900*10^6 lambda = c/carrierFreq baseHeight = 30 mobileHeight = 2 pathLossExponent = 3 shadowingValue = 0 transmitPower = 10