sub_njd

matlab 的短时傅里叶变换代码， STFT， 简洁实用(code of STFT with matlab)

对MATLAB编程以及数值算法的简介，英文原版电子书(An Introduction to Programming and Numerical Methods in MATLAB)

求两个序列的互相关函数，或一个序列的自相关函数；并显示了不同功率噪声下的效果。(Sequences for the two cross-correlation function, or a sequence of auto-correlation function and display a different power under the effect of noise.)

Writes a mesh to a ply file (text format) wich can be read by PlyView from Cyberware and Scanalyze from Stanford University. Both are available for free

Simulink sequence dependent setuptimes example

That code is done for Load flow.the basic tool for power system, based on Newton Raphson method

优化问题求解方法包括牛顿法、共轭梯度法和最速下降法(The optimization problems are solved by Newton method, conjugate gradient method and steepest descent method)

kalman滤波编程，对误差进行分析，俩个图像(kalman filtering sigma point)

多项式和非多项式曲线拟合，多项式拟合在matlab中可以使用polyfit函数求解多项式系数，通过polyval函数求解拟合多项式在某数据点处的值(Polynomial and non-polynomial curve fitting, polynomial fitting in matlab polyfit function can be used to solve polynomial coefficients, solve the value of a data point to fit a polynomial function by polyval)

求逐月异常序列x(n,12)和y(n,12)(n是年)的相关系数r(24)，其中j=1～12是1～12个月的情形，13～22是冬、春、夏、秋、冬季逐月、春季逐月、夏季逐月、秋季逐月、逐月、年、冬半年逐月（NDJFMA）、夏半年逐月（MJJASO）的序列的情形 (Abnormalities associated)