﻿功能:常规矩阵的QR分解.

格式:
[Q,R]=qr2(A)
A:为矩阵变量
Q:返回的正交单位矩阵
R:返回的上三角矩阵

说明:A=Q*R

例子:
a =
 [ 18.5320241463054   64.1258794181635   96.8250568475691   84.5243670439927
   73.8758117304536   33.1442962089294   14.0351610789239   26.0880021034218
   33.988520425739    33.0324301649967   43.37250340887    82.4822802015032 ]

[q,r]=QR(a)//回车得到如下解
q =
 [ -0.222194848995945  0.932281322968542   0.285448741324417
   -0.885754556669597 -0.315377319903372   0.340552509063743
   -0.407514802698888  0.177168509997095  -0.895847645890023 ]
r =
 [ -83.4043823700143  -57.0673557500705   -51.6206739337405   -75.5011958517997
   0                   55.1827068259466    93.5260624126662    85.1861872303046
   0                   0                  -6.43685514884812   -40.8798477894267 ]