Dear Reaserchers,

sorry for desturb you, but i tryed several solution but without results. I
have a data.frame (it's an example to explain)

df <- data.frame(x=c("a","b","c"),y=c(1,2,3))

> df
  x y
1 a 1
2 b 2
3 c 3


and i wish to change same paramters in the column "x" as the following
result

> df
  x y
1 a 1
2 b% 2
3 c 3


thanks in advance. Normally to result easy stuff we spent a afternoon when
you need to send the result in the night

Gianni

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