t-coupla求相关系数，包括正态分布，t分布，和其他copula函数的基本代码-t-copula，mainly used in t copula corrention

判断一组数据的概率分布函数，包括正态分布、泊松分布、伽马分布等。-The probability distribution function to determine a set of data, including a normal distribution, the Poisson distribution, gamma distribution.