%5-4  5-2еַȡֵ㡣
5⣺Enterȷϡ
>> a=abs(str)
a =
  Columns 1 through 7 
20170       22825       65292       26159      50           48         .48
  Columns 8 through 14 
53       24180          49          48       26376          50          53
  Columns 15 through 21 
26085       65292          32       25105       20204       29677       19968
  Columns 22 through 28 
36215       21435       19978       28023       26053       28216       12290
>> 
