Modified_KMeans

this is a algorithm Fast PCA, it is very suitable for beginer who want to understand PCA, it is demo step by step

此为《MATLAB教程》的第八章：特征值和特征向量。该书内容翔实，深入浅出，不可多得。(This is the MATLAB Guide in Chapter VIII: Eigenvalues and eigenvectors. Book is informative, easy, hard to come by.)

This code shows you how to generate level set descriptions of various three dimensional interfaces.

基于Mathcad（也可转为matlab程序）的旋转系绳系统模型，以牛顿力学建模，考虑系绳弹性，可用于任意开普勒轨道建模仿真。(The Mathcad based model of the rotating tether system, which considers the tether elasticity, can be used for arbitrary Kepler orbit modeling and simulation.)

OFDM仿真原始代码。基于matlab实现OFDM的全过程。压缩文件中包含7个文件。(OFDM code files, include the whole procedure of OFDM. there are seven files in this package.)

flow in porous media by lbm 3d

The receiver performance is quantified by depicting the receiver operating char- acteristics (ROC) curves. This curves serve as a tool to and study the performance of a sensing scheme. ROC graphs are employed to show trade-of vs between detection probability and false alarm rates, (i.e. PD versus PFA), thus allowing the determination of an optimal threshold. To illustrate the performance of energy detectors, we generate complementary ROC curves (the average probability of miss detection $ P_{md} 1 - P_d$ versus the false alarm probability $P_f$ for different receiver structures and in different fading environments.Fig. 1 illustrates the complementary ROC curves for a single channel reception (no diversity) over AWGN channels. This figure depicts the complementary ROC curves for energy detectors.

it generates a runtime error if its this value is not a Number object.

以Logistic曲线为例,利用Matlab编程计算非线性回归模型(To Logistic curves were calculated using Matlab programming linear regression model)

说明：  基于最小二乘法的曲线拟合，m文件带有仿真数据(Based on least squares curve fitting, m file with the simulation data)