expriment

the code has written by fortran language and extend finite element method (XFEM) in order to calculate grow of crack in material

以实际应用中的一些具体问题为基础，详细介绍多种情况下MATLAB的使用方法(Based on some specific issues of practical applications,introduce how to use MATLAB in many cases.)

Differential Pulse Code Modulation  DPCM is the coding method for DC coefficients

时频窗口选取并计算，有效选择时频窗口。对初学者有用(yields a window of length N with a given shape)

LLE算法是一种非线性数据降维方法，其特点是简单。(LLE algorithm is a kind of nonlinear data dimension reduction method. Its characteristic is simple )

Calculate SNR for designing SDM

勒让德多项式的拟合，包括对新的数值的求解(Legendre polynomial fitting, including the new value of solving)

估计功率谱的经典方法，即周期图和修正周期图法(Estimate the power spectrum of the classic method, ie, the period map and corrected periodogram)

MATLAB函数为pm哈尔1-D DWT算法 离散哈尔的基本原理小波变换(MATLAB function for pm Haar 1-D DWT algorithm,Fundamentals of the discrete Haar wavelet transform)

Matlab 批量读写txt文件，打开文件夹里面所有的txt文件 然后进行运算 保存为其他格式的文件， 如dat 已调试，能够运行(Matlab batch literacy txt file, open the folder inside all the txt file and then save operation documents to other formats, such as dat has been debugged, to run)