level-set-20120914

傅立叶变换的C语言实现，可在Turbo C以及Visual C++下实现。(Fourier Transform C language, in Turbo C and Visual C under.)

一组很好的FDTD计算二维光子带隙的程序，matlab 7.0以上版本适用(a good group of FDTD calculation of two-dimensional photonic bandgap procedures, Matlab 7.0 and above versions of the application)

一个计算两个信号频率差的Matlab程序,主要用于求多普勒频偏。(A Matlab program to calculate the Doppler shift )

说明：  三维FDTD程序,一个Fortran写的三维FDTD程序(Three-dimensional FDTD procedure, a Fortran program written by three-dimensional FDTD)

由美国圣母大学Jena教授及其学生编写的关于计算半导体迁移率的matla脚本文件。(Jena professor from the University of Notre Dame and his students prepare for the calculation of a series of semiconductor mobility matlab script file.)

有限元NONSAP源程序，里面带有例子，大家可以参考。(Finite element NONSAP source, which with examples, we can refer to.)

说明：  在matlab实现基于Schmidt的QR分解，共轭梯度法等(QR decomposition based on Schmidt in MATLAB)

基于matlab的短时傅立叶变换，有语音读取功能！(Based on the short-time Fourier transform matlab, have voice reading!)

数值分析实验1.明确插值多项式和分段插值多项式各自的优缺点； 编程实现拉格朗日插值算法，分析实验结果体会高次插值产生的龙格现象；(Experiments of numerical analysis 1. Define the advantages and disadvantages of interpolation polynomials and piecewise interpolation polynomials. The Lagrange interpolation algorithm is programmed, and the Runge phenomenon produced by high-order interpolation is analyzed.)

非线性算法合集，包括牛顿拉夫逊法，Broyden拟牛顿法，弧长法，割线法。每种算法都包含有线性搜索迭代改进。(Nonlinear algorithm collection, including Newton Raphson, Broyden quasi-Newton method, arc-length method, secant method. Each contains a linear search algorithms for iterative improvement.)