fft（贺万堑）

说明：  用C语言编写多元线性回归方程，写得不好的地方请指教！(Using C language multiple linear regression equation, where poorly written, please advice!)

工程领域，PR方程代码.用于计算混合工质性质。(PR equation code)

关于超声波倒车雷达测距的，最大信噪比的独立分量分析算法，小波包分析提取振动信号中的特征频率。( About ultrasonic parking radar ranging, SNR largest independent component analysis algorithm, Wavelet packet analysis to extract vibration signal characteristic frequency.)

矩阵运算实矩阵相乘复矩阵相乘实矩阵求逆的全选主元高斯约当法(matrix calculation real matrix multiplication complex matrix multiplication matrix inversion is a wholly-elected PCA Gaussian about when France, etc.)

gmres 方法。视图求解线性方程组A*x=b的解x。nXn的稀疏矩阵A必须是方程且应是大型稀疏矩阵。列向量b的长度必须为n。(gmres method. View solving linear equations A* x = b the solution x. nXn sparse matrix A must be equation and should be large sparse matrix. The length of the column vector b must be to n.)

一元稀疏多项式编程，希望对大家的编程有点用，欢迎下载(hope it useful to you)

二阶微分方程组，采用龙格库塔法求解，将二阶降为一阶之后在求解。(Second-order differential equations, using the Runge-Kutta method to solve the second-order reduced to an order after solving.)

分数傅里叶变换和分数余弦变换，动态展示实部，虚部和模值(Computation of the Fractional Fourier Transform)

三次样条插值函数实现 运行后画出曲线图，并得到插值函数表达式。(spline3)

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)