srfft

之前找不到合适精度的log2x函数的定点化源码，经过实现并验证后，发上来大家一起学习(fixed version for log2x)

fluent中用于修改湍流粘度系数的自定义函数(udf to modify turbulence viscosity coefficient in fluent)

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

说明：  使用EPTREE可以很好的对，C,C++，Java代码进行解析。绘出函数树图，计算堆栈大小等。 <输出的文件内容> 功能树 INKURUDOFAIRUTSURI 测量若干步骤（有条件汇编） 函数索引（使用堆栈大小为每个功能输出） 使用类名单 全局变量，变结构，对象名单 ＃定义定义列表 清单中所使用 列表名称 信息分布函数的行数(EPTREE can be used for good, C, C++, Java code analysis. Mapping function tree diagram, calculate the stack size. )

8.1 最小二乘曲线拟合hpir1.c 8.2 切比雪夫曲线拟合hchir.c 8.3 最佳一致逼近的里米兹法hremz.c 8.4 矩形域的最小二乘曲面拟合hpir2.c(8.1 Least-squares curve-fitting hpir1.c 8.2 Chebyshev curve fitting the best uniform approximation hchir.c 8.3 years Meeds law hremz.c 8.4 rectangular domain least-squares surface fitting hpir2.c)

计算器编程代码，便于需要编程计算器的学员查询相关代码(Calculator programming code, to facilitate students in need of programming calculator related code)

数值计算实例，主要有LU分解，龙格库塔法，高斯分解法，欧拉法，曲线拟合，曲线插值(Numerical example)

用来计算航天器再入质点弹道，其中包括插值算法，龙格库塔法以及大气模型(Used to calculate the particle trajectory of spacecraft re-entry, including the interpolation algorithm, Runge-Kutta method as well as atmospheric model)

吉尔算法积分一阶微分方程组初值问题的C语言描述，包括主函数、计算微分方程组中各方程右端函数值的函数程序、计算雅克比矩阵的函数程序、矩阵求逆程序等。(GEAR algorithm integral first order differential equations initial value problem of the C language description, including the main function to calculate the differential equations in the equation right function value function procedures, functions Jacobian matrix calculation procedures, matrix inversion procedures.)

基二、基四、基八 FFT变化源代码，有详细注解(Second base, the base four or eight FFT-based changes in the source code, detailed comments)