拉丁超立方抽样，调用方式如下：S=lhs(m,dist,mu,sigma,lowb,upb)

m: a scalar,the number of sample points

dist: A row with distribution type flags of basic random variables the

value of the flag can be 1 (for uniform distribution, 2(for normal distribution), 3(for lognormal)

and 4(for extreme type 1).

mu: A row vector comprising the mean value of basic random variables.

sigma: A row vector with its length equaligng to mu,including the standard

deviation of basic random variables.

lowb: a row vector with its elements are the lower bound of the sampling

interval

upb:a row vector with its elements are the upper bounds of the sampling

interval

dist,mu,sigma,lowb,upb must have the same length.

Output argument

S: sampling point matrix, of which each row is a sampling point.-code of Latin Hypercube Sampling