fft2d

三次样条曲线拟合代码，先训练，后差值，计算非常准确(Three times spline curve fitting, the first training, and after, computation is very accurate)

利用下载的goce原始数据，计算得出含有时间/经纬度/重力梯度格式的程序(Use downloaded goce raw data, calculated with the time/latitude/gravity gradient program formats)

关于房屋贷款贷款的计算，包含本息、本金、一次性付款等贷款方式(Calculated on mortgage loans, including principal and interest, principal, and other one-time payment of loans)

frft程序函数，分数阶傅立叶变换，短时傅立叶变换，傅立叶变换(the frft program function, fractional Fourier transform, short-time Fourier transform, Fourier transform)

大地测量学软件，可以计算各种物理量，包括重力梯度等(geodesy software)

基于蒙特卡罗模拟的概率潮流计算 基于蒙特卡罗模拟的概率潮流计算(Probabilistic power flow calculation based on Monte Carlo simulation to calculate the probability of the trend based on Monte Carlo simulation.)

ISAAC采用多块网格技术求解二维或三维的Euler或者NS方程，并且提供了大量的湍流模型供使用，为相关研究人员提供了很好的参考。(ISAAC solves 2D or 3D Euler or NS equatioon based on a multiblock grid technique, also lots of turbulence models is included in the code. ISAAC provides a good reference for relative researches.)

说明：  并联机器人MARALAND,其数值解及解析解，正解和逆解以及雅可比矩阵及动力学问题分析(Parallel robot maraland, its numerical solution and analytical solution, positive solution and inverse solution, Jacobian matrix and dynamics analysis)

利用C语言实现MOORE-PENROSE广义逆矩阵的计算，经试验OK。(The realization of MOORE-PENROSE generalized inverse matrix is calculated by using the C language, through the test of OK.)

Orthogonal Polynomials Approximation 数值分析，计算正交基多项式的系数 (Given a function f and a set of m >0 distinct points . You are supposed to write a function to approximate f by an orthogonal polynomial using the exact function values at the given m points with a weight assigned to each point . The total error must be no larger than a given tolerance. Format of function int OPA( double (*f)(double t), int m, double x[], double w[], double c[], double*eps ) where the function pointer double (*f)(double t) defines the function f int m is the number of points double x[] contains points double w[] contains the values of a weight function at the given points x[] double c[] contains the coefficients of the approximation polynomial double*eps is passed into the function as the tolerance for the error, and is supposed to be returned as the value of error. The function OPA is supposed to return the degree of the approximation polynomial. Note: a constant Max_n is defined so that if the total error is still not small enough when n = Ma)