for example:
  a data.frame
  data
  V1  V2 V3
  1     2   3
  4     5   6

If I want to calculate the V2
 I can get data$V2
 But now I want to calculate the dimension name and then analysis the data.
for example
No=3*x ;x=1,2,3,...n
 anadata=data$VNo
How could I do?
-- 
TANG Jie

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