usgs_dem_1

根据已知的三维离散数据（x,y,z）,在MATLAB中利用此函数进行三维曲面拟合，再根据polyval2d得出拟合函数的系数矩阵。(according to 3D discrete datum (x,y,z),use this function in MATLAB to fit 3D surface, and use polyval2d to get coefficient matrix)

This a ddk filter sample for keyboard

C++求圆的面积小程序 输入圆的半径，便可以求出圆的面积。。 主要熟悉C++编程(C++ calculate a area of ​ ​ a circle program)

Based on ECMA 2 Draft 7 February 1999.

本程序基于visual C++ 实现标准正态分布，正态分布累积函数，正态分布累积函数的逆函数分别输出到不同表，是仿真实验的很好参考！(This procedure based on visual C++ Achieve the standard normal distribution, the cumulative distribution function, the cumulative distribution function of the inverse function of the respective output to a different form, is a good reference simulation!)

交错网格声波方程正演模拟，交错网格有限差分地震波场计算，二维的声波正演，利用空间10阶，时间2阶。(The CalCulation of the SeismiC Wave一 fieldwith Staggered-grid Finite difference Sheme)

说明：  最近在研究数字喷泉码，这是对LT码的仿真，系统XP，语言C++(Recent study of digital fountain codes, LT codes which is the simulation, the system XP, language C++)

这是信息论里的知识，有循环编码、香农编码、费诺编码的程序(This is the knowledge in the information theory, a cycle encoding, shannon coding, coding procedure fee)

Integers is given a rectangular matrix. define: 1) The number of rows containing at least one zero element 2) the number of the column in which the longest series of the same elements

说明：  国内的一篇相控阵雷达分选的论文 不错 利用模糊理论(chinese paper on sorting of phased array radar )