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QPSk误码性能的仿真程序，包括AWGN信道和瑞利信道性能曲线(QPSk BER performance simulation procedures, including the AWGN channel and Rayleigh channel performance curve)

本工具箱主要为学习数学建模和参加中国大学生数学建模竞赛的同学而制作。汇集了 数学建模常用的最优化、微分方程、数据拟合、统计等方面的计算工具，包括我们自 编的补充工具。工具箱还汇集了96-99中国大学生数学建模竞赛题解MATLAB程序。本 工具箱也可供使用MATLAB作数值计算的学生、教师和科技人员参考。(This toolkit is mainly mathematical modeling study and participated in the China Mathematical Contest in Modeling the production students. A collection of commonly used mathematical modeling optimization, differential equations, data fitting, statistics and other aspects of computational tools, including our self complementary tool. The toolbox also brings together 96-99 China Mathematical Contest in Modeling problem solution MATLAB. The toolkit is also available using MATLAB for numerical calculation of the students, teachers and technology officers.)

交错网格---非均匀介质二维声波方程(一阶压力--速度)、2阶时间差分、2阶空间差分精度(Staggered grid- heterogeneous medium two-dimensional acoustic wave equation (first-order pressure- speed), 2 order time difference, space 2 order difference accuracy)

双向渐进结构拓扑优化原始代码，采用软杀伤法的BESO( the source code of Bidirectional evolutionary structural topology optimization with the soft kill law BESO)

the day of year是指这一年已经逝去的天数（包括当天） 。在平年中，它的取值范围为 1 到 365，在闰年中，它的取值范围 1到 366。编写一个 MATLAB 程序，输入年，月，日， 输入为对应的 the of year。 (the day of year is the year the number of days have been lost (including the day). In the average year, it ranges from 1 to 365, in a leap year, it ranges from 1 to 366. Write a MATLAB program, enter the year, month, day, enter the corresponding the of year.)

segments an image IM into square regions of size LxL pixels starting from the top left. Remaining portions of IM, that are smaller than LxL will be discarded. If F=1, the function will create figures for visualization. If F=0, no figures are created. The function returns SEG, a cell array containing the image segments.

说明：  用CG法、GS法和Jocabi法求解Poisson方程(CG GS Poisson equation)

说明：  用窗函数法设计一个能对模拟信号进行滤波的线性相位FIR低通滤波器。抽样频率为 kHz，通带截止频率为 kHz，阻带截止频率为 kHz，要求阻带最小衰减 dB。为了降低运算量，所设计滤波器的阶数要尽可能的低(With the window method to design a filter to the analog signals of linear phase FIR low-pass filter. Sampling frequency is kHz, passband cutoff frequency kHz, stopband cutoff frequency of kHz, the minimum required stopband attenuation dB. To reduce the computation, the order of the filter designed to be as low as possible)

局部滤波器的特征提取方法，能够很好的反映图像的细节特征和纹理特征。(The characteristics of the local filter extraction method can be a good reflection of the details of image features and texture features.)

好东西大家分享，希望可以给大家帮助，谢谢！(Good things to share, hope can give you help, thank you!)