﻿功能:对方阵进行LU分解.

格式:
[L,U]=lu(A)
A:一个n解方阵变量

说明:函数执行完毕返回矩阵A的LU分解,即L*U=A.其中L为下三角矩阵,U为上三角矩阵且对角线全为1

例子:
a =
 [ 9.52295674454558    2.62114554300026    4.02599394508917
   9.65538669827179    5.3693214502974     1.73833080648367
   4.36154077032653    9.50125717069081    6.00379359256653  ]

[l,u]=lu(a)//回车得到如下结果
l =
[ 9.52295674454558    0.00000000000000    0.00000000000000
  9.65538669827179    2.71172523422567    0.00000000000000
  4.36154077032653    8.30076519562190    11.3339409362953 ]
u =
[ 1.00000000000000    0.27524492794756    0.42276721958178
  0.00000000000000    1.00000000000000   -0.86426535858117
  0.00000000000000    0.00000000000000    1.00000000000000 ]