f1

Interpolation using Lagrange

独立主成分分析的工具箱，是模式识别，成分分析，线性判别的重要手段。(independent Principal Component Analysis Toolbox, pattern recognition, component analysis and linear discriminant an important means.)

for phase plane trajectory

说明：  小波包分解程序以及小波熵等程序，可以参考学习(Wavelet packet decomposition procedures and wavelet entropy procedures, can refer to learning)

里面包含了怎么找出一个函数的极点，并用spline函数画出sinc函数的包络线，稍加修改可画出其他的函数的包络线(To draw envelope of sinc function. You can modify it to draw other functions envelope)

说明：  code for calculate lyapnov exponent largest good

读取并存储nc文件，不同的文件里的参数可能不一样，按格式修改即可。(Read and store NC files, the parameters in different files may be different, and can be modified according to format.)

To calculate the Image feature using wavelets

一个非常红的画图程序，非常有意思，再此上传下(A very red paint program, very interesting, upload it again next)

变频信号的快速FFT变换，能准确的给出信号的频谱特征(Fast FFT of the signal frequency, can give accurate spectral characteristics of the signal)