﻿功能:采用LU分解算法求方阵行列式.

格式:Det2(a)

说明:a为方阵

注意:本函数效率没有Det函数效率高

例子:
a =
 [ 24.670817016005   97.0357947969045  89.6194347132088
   2.72601312153321  14.5667740211667  58.9581970399982
   6.19456609999508  60.2519491967987  8.23347480419719 ]
b=det2(a)//回车得到如下结果
b =
 [ -44785.8743735347       ]