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说明：  一楼房的后面是一个很大的花园. 在花园中紧靠着楼房有一个温室,温室伸入花园2m,高3m,温室正上方是楼房的窗台. 清洁工打扫窗台周围,他得用梯子越过温室,一头放在花园中,一头靠在楼房的墙上. 因为温室是不能承受梯子压力的,所以梯子太短是不行的. 现清洁工只有一架7m长的梯子, 你认为它能达到要求吗? 能满足要求的梯子的最小长度为多少?(The back of a building is a big garden. In the garden close to a building in a greenhouse, greenhouse into the garden 2m, high-3m, the greenhouse is the top of the building' s bay windows. Cleaners cleaning around the windowsill, he crossed to use a ladder greenhouse, on a garden, against a building wall. because of the greenhouse can not bear the pressure of a ladder, so the ladder is not too short. cleaners are only a 7m long ladder, do you think it can meet the requirement it? ladder to meet the requirements of the minimum length of the number?)

Particle in cell 方法的matlab代码，非常基础，算例是空间存在一带电平板情况下，等离子体的电场分布和离子密度分布。作为入门非常好。(Particle in cell method matlab code, very basic, there is a numerical example is charged under the flat space case, the electric field distribution of plasma and ion density distribution. As entry is very good.)

运用FRFT在OFDM系统中的仿真与最佳角度的探究(FRFT in OFDM systems using simulation and explore the best angle)

采用自相关法提取基音周期，提取周期与实际值误差较小(Using autocorrelation method to extract the pitch period extraction cycle with the actual value of the error is smaller)

open loop boost converter using ramp input

利用matlab软件和fdtd方法来算三维结构同轴电缆的程序(periodic 3d tongzhou resonanter)

viterbi译码算法的matlab源代码(viterbi decoding algorithm matlab source code)

支持向量机matlab代码,用于分类和拟合(programme in matlab)

说明：  用于广播系统发射机的数字中频调制采用64QAM的方式，使用matlab中的altera dsp builder实现。(64QAM modulator, used in broadcast system digital IF modulation.)

分数阶微积分：oustaloup近似滤波器生成方法，和纯分数阶微分方程解法(fractional calculus: Oustaloup approximation filter generation method, and the solver of pure fractional differential equation)