test_noise

三项锁相环：利用park变换和clark变换，将三相电网电压，变换为两相旋转坐标系下的电压。同时跟踪A相电压的相位角(Three phase-locked loop: the use of park conversion and clark transformation, the three-phase voltage, transformed into two-phase rotating coordinate system voltage. While tracking the phase angle of phase A voltage)

一种多目标优化算法的matlab程序，能够实现大量目标的同时优化，对多目标优化算法的学习很有帮助(a multi-object optimization matlab program,can optimize large object at meantime it will contribute to those who want to study muti-object optimization algorithm)

Input data is the MS Excel file, where the table of nodes, table of elements, nodal external loads vector and boundary conditions are stored. After running the mabs2d.m file on the Command Window, the program calculates the stiffness matrix in local coordinates kiL (element i). Once the transformation matrix associated to the element is obtained, the stiffness matrix in global coordinates kiG is also calculated. The table of connectivity is automatically generated for the assembly process and then computes the complete stiffness matrix of the structure.

classification using PNN classification

matlab模拟的树形分形图，可方便快捷的理解分形理论，学习数学迭代关系(matlab)

利用球贝塞尔函数和汉克尔函数计算低频、中频、高频的雷达散射截面。(The calculation of the radar cross section of low frequency, intermediate frequency, high frequency by using the spherical Bessel function and Hankel function.)

说明：  数据降维工具箱，包括一些典型算法，例如pca，lle，mds，lda等。(Data dimension reduction toolbox, including some typical algorithms, such as PCA, LLE, MDS, LDA, etc.)

对图像进颜色空间分割，并进行聚类分析，代码简单，直接运行即可(clustering)

lms即最小均方误差算法，此次上传的是lms算法的matlab文件(lms that minimum mean square error algorithm, the uploaded file is lms algorithm matlab)

matlab中的巴特沃斯滤波器的C语言实现(matlab butterworth filter in C language)