hi R users
  I have a data set with the name AA
AA<-1:100
Now I want to get a child array from AA every 10 numbers
e.g.
ab =c(10,20,30,40,50,60,70,80,100)

How could I subtract aa from AA?
thank you .
-- 
TANG Jie
Email: totangjie@gmail.com
Tel: 0086-2154896104
Shanghai Typhoon Institute,China

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