Hi,

I search a way to replace multiple occurrences of a string with  
different strings
depending on the place where it occurs.


I tried the following;

x <- c("xx y e d xx e t f xx e f xx")
x <- gsub("xx", c("x1", "x2", "x3", "x4"), x)


what I want to get is;

x =
x1 y y e d x2 e t f x3 e f x4


but what I get is;

x =
x1 y y e d x1 e t f x1 e f x1
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