﻿功能:按列排序

格式:SortCol2(A,n)

说明:对矩阵A按第n列的数据进行降序排序
a  =
  [84.7295483037501  58.3373080745047   35.0307805161135  8.40784758720912
   89.5254210054527  90.8885946920554   15.1445259876291  5.10388026251638
   69.8388621070603  1.89814707352694   33.6651019908791  99.4144568682716
   83.0442655286958  0.190461799591063  32.9030513916644  20.4048208987363]
sortcol2(a,4)//执行命令
ans =
  [69.8388621070603  1.89814707352694   33.6651019908791  99.4144568682716
   83.0442655286958  0.190461799591063  32.9030513916644  20.4048208987363
   84.7295483037501  58.3373080745047   35.0307805161135  8.40784758720912
   89.5254210054527  90.8885946920554   15.1445259876291  5.10388026251638]