data-fit

一个简单的傅立叶带亮度描绘子提取图像的形状特征程序(A simple Fourier descriptor with the brightness of the image shape feature extraction procedures)

说明：  C-means in 2 types. C=2

用于测试hadoop的mapreduce功能，功能与自带的wordcount程序大相径庭。(Use to test the mapreduce function of hadoop,this program was seem to the origin program.)

一个用FTT法实现相关函数的快速估计程序(A correlation function with the FTT method to achieve the rapid estimation procedures)

说明：  计算时程信号数据的快速傅里叶变换，进行频谱分析(The fast Fourier transform of time history signal data is calculated and the spectrum analysis is carried out)

计算大气密度的程序 用于航空宇航研究的基础程序(With the code you can getting the atmosphere denisity along the height)

求解时滞微分方程的龙格库塔方法！用matlab编写的。(Solving Delay Differential Equations Runge-Kutta methods! Prepared using matlab.)

牛顿插值公式：构造插值函数空间的基函数得到的多项式逼近的方法——牛顿插值法。用于多项式插值逼近。(Newton interpolation formula: Construction interpolation function space available basis function polynomial approximation method- Newton interpolation. Approximation for the polynomial interpolation.)

利用表达式求解和栈的只是，设计一个简易的数学题库， 可供小学生作业，并能给出分数。 要求：建立试题库文件，随机产生 n 个题目；题目涉及加减乘除，带括弧的混合运算；随时可以退出；保留历史分数，能回顾历史，给出与历史分数比较后的评价。(Use solving expressions and stack just design a simple math exam, students for the job, and can give a score. Requirements: Create test file, randomly generating n topics topics involving addition, subtraction with parentheses mixing operation ready to quit keep historical scores, can look back at history, and history is given uation scores after comparison.)

fsolve函数求非线性方程组数值解，已经验证其正确性。(fsolve function for the numerical solution of nonlinear equations)