danfengmatlab

this file helps for optimization using hybrid swarm intelligence.

计算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，输出为对应的该天是当年的第几天。 闰年是这样规定的 1）.能被400整除的年为闰年 2）能被100整除但不能被400整除的年不为闰年 3）.能被4整除但不能被100整除年为闰年 4）.其余的年份不为闰年 (This year has calculated the number of days elapsed (including that day). In non-leap year, it ranges from 1 to 365 in a leap year, it s the range of 1 to 366. Write a MATLAB program, enter the year, month, day, corresponding to the output of the first year of the day is a few days. This leap is required 1) is divisible by 400 is a leap year 2) can be divisible by 100 but not divisible by 400 years is not a leap year 3) be divisible by 4 but not divisible by 100 is a leap year 4) the rest of the year is not leap year)

copula函数 模型建立 相关性分析 模型拟合检验(Establishment of correlation analysis by copula function model)

matlab 一些常用算法源码,对初学者，matlab常用的人非常有用(goog materials for matlab )

Matlab to seperate 3 voices

说明：  用matlab实现不规则多边形网格的划分(Using matlab to achieve the division of irregular polygonal meshes)

应用于变量选择的PCA 和 PLS 程序！利用它可以选出独立的变量数!在化学中很有用！(for variable selection procedures PCA and PLS! It makes it possible to elect independent variables! In Chemistry useful!)

原对偶内点法求解非线性最优化问题的测试程序，能准确快速的收敛到最优值(Primal dual interior point method for solving nonlinear optimization problem of the test procedure can accurately and quickly converge to the optimal value)

CODE DE RESOLUTION DE L EQUATION D HELMOTZ EN FORMULATION INTEGRALE 2D Problème Fréquentiel Intérieur avec Condition en flux (Neumann)

忽略系统阻尼，建立工程车辆的扭转振动模型，进行振型分析。(Ignoring the system damping, the engineering vehicle torsional vibration model is established to do the vibration analysis.)