FFT

说明：  你输入一个长方体的长和宽以及高，就可以输出他的面积(input height，width，length，output volume)

本程序是用数学方程试计算出一个点在一条线上的垂线坐标，并判断出在线内外，是测量中用的程序！(The test procedure is used to calculate the mathematical equation of a line a point in the vertical coordinate, and determine the line outside, the procedure used to measure!)

计算方法程序:多项式拟合(Calculation procedure: Polynomial Fitting)

TOCHNOG PROFESSIONAL，有限元开源源程序。c++语言(TOCHNOG PROFESSIONAL, finite element open source. c++ language)

music高阶谱分析算法，IDW距离反比加权方法，BP神经网络用于函数拟合与模式识别。( music higher order spectral analysis algorithm, IDW inverse distance weighting method, BP neural network function fitting and pattern recognition.)

说明：  VC实现，天文导航算法及实现 包括数据的获取、加工、处理、保存为文件(VC, astronomy, navigation algorithm and implementation including data acquisition, processing, handling, preservation of documents)

计算机常用数值算法与程序(C++版) (Commonly used numerical algorithm of computer and program )

C++实现的数值分析算法包括： 二分法.cpp 复化辛卜生公式.cpp 改进欧拉法.cpp 高斯-赛德尔迭代法.cpp 拉格郎日插值多项式.c(C achieve the numerical analysis algorithms include : dichotomy. cpp Minute of Oracle Health formula. cpp Improved Euler method. cpp Gauss- Seidel iterative method. cpp Lagrange polynomial interpolation. c)

严格的衍射积分计算，实现光栅结构透过反射场2维分布的严格解计算，利用散射积分对耦合模方程进行严格计算解 衍射，光栅，场，二维，积分，散射矩阵，耦合模理论(Strict calculation of the diffraction integral, the grating structure is realized through the rigorous solution of the 2 dimensional distribution of the reflection field. Diffraction, grating, field, two-dimensional, integral, scattering matrix, coupled mode theory)

QR分解法是目前求一般矩阵全部特征值的最有效并广泛应用的方法，一般矩阵先经过正交相似变化成为Hessenberg矩阵，然后再应用QR方法求特征值和特征向量。它是将矩阵分解成一个正规正交矩阵Q与上三角形矩阵R，所以称为QR分解法,(QR decomposition )