numerucal-methods-to-solv-deff-equations

说明：  极坐标牛拉法和PQ分解法计算IEEE14节点(Calculation of IEEE14 nodes by polar coordinate niula method and PQ decomposition method)

求解线性规划逆问题的光滑牛顿法的程序，时间很快，精确度也很高(Solving the inverse problem of linear programming procedure smooth Newton method, the time soon, is also very high accuracy)

用matlab实现图像的灰度线性变换，图像二值化，负象变换，灰度非线性变换等。(Grayscale image using matlab linear transformation, binary image, negative image transformation, gray non-linear transformation.)

Matlab中有很多根据多边形顶点计算多边形面积，对多边形涂色等函数，但是并没有对多边形顶点进行凸多边形排序问题，所以写了这个对可以构成凸多边形的顶点进行排序的算法。( 此子程序功能为逆时针排列多个可构成一个凸多边形的顶点 输入参数xv是这些顶点的横坐标集合 yv是这些坐标的纵坐标集合 返回的排列好的点的横坐标和纵坐标集合. 使用示例: [x y]=rangePolyponPoint([0 10 10 0],[0 10 0 10]) 输出结果为：x = [ 0 10 10 0], y = [ 0 0 10 10].)

利用分数阶傅立叶变换进行信号参数估计，本程序是对LFM信号的参数中心频率和调频斜率进行估计(Use FRFT signal parameter estimation, the parameters of this program is the center frequency and frequency rate LFM signal is estimated)

说明：  mdfkgfrevfieogmte lvtmpbmtrp "gteympvftr tg (jnoirenmtgoljvbe /fjrmpgjpg)

随机数发生器 此功能会产生连续的值（功法的文章中讨论的五个分布随机分布，指数，对数正态分布，拉伸指数，截止功法）。使用信息包含在文件类型的帮助randht在MATLAB提示符更多信息。 幂律分布拟合 这项功能同时实现的离散和连续的最大似然估计拟合幂律分布的数据，以及善良的合适的方法来估计缩放区域较低的截止。使用信息包含在文件类型的帮助plfit在MATLAB提示符更多信息。(This function is a random number generator will produce discrete values ​ ​ (power law discussed in five articles distributed random distribution, exponential, lognormal, stretching index cutoff power law). The use of information contained in the file type of help randht in MATLAB prompt for more information. Power-law distribution fitting This function implements both discrete and continuous maximum likelihood estimation fitting power-law distribution of data, and kind suitable method to estimate the scaling region lower cutoff. The use of information contained in the file type of help plfit in MATLAB prompt for more information.)

液压泵振动信号的小波包分解以及功率谱分析，仿真信号的Hilbert谱以及边际谱；仿真信号的小波包能量计算(wavelet packet decomposition and power spectrum of vibration signals for piston pump Hilbert spectrum and marginal spectrum of stimulated signals)

说明：  多边形平板高频散射,采用物理光学发求解多边形平板的雷达散射截面(Polygonal planar high frequency scattering, Using physical optics to solve the radar cross section of a polygonal flat plate)

：Matlab具有强大的数值计算和分析等能力，而C／C++是目前最为流行的高级程序设计语言，两者互补结合的混合编 程在科学研究和工程实践中具有非常重要的意义。因此，从Matlab调用c，C++代码及c，C++调用m文件两方面，深入地研究 了它们之间混合编程的原理和实现机制，并且给出了具体条件下的混合编程方法和步骤。(: Matlab has powerful numerical calculation and analysis capabilities, while the C/C++ is currently the most popular high-level programming language, which combines a mixture of complementary programming in scientific research and engineering practice of great significance. Therefore, from the Matlab call c, C++ code and c, C++ to call two m files, in-depth study of a hybrid between them and the realization of the principles of programming mechanisms, and under specific conditions are given a mixture of programming methods and procedures.)