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Change variable name in for loop using R

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r

People also ask

How do you change a variable name in R?

I'll just say it once more: if you need to rename variables in R, just use the rename() function.

How do you define a variable in a loop?

Declaring Loop Control Variables Inside the for Loop, When you declare a variable inside a for loop, there is one important point to remember: the scope of that variable ends when the for statement does. (That is, the scope of the variable is limited to the for loop.)


d <- 5
for(i in 1:10) { 
 nam <- paste("A", i, sep = "")
 assign(nam, rnorm(3)+d)
}

More info here or even here!


You could use assign, but using assign (or get) is often a symptom of a programming structure that is not very R like. Typically, lists or matrices allow cleaner solutions.

  • with a list:

    A <- lapply (1 : 10, function (x) d + rnorm (3))
    
  • with a matrix:

    A <- matrix (rep (d, each = 10) + rnorm (30), nrow = 10)
    

Another option is using eval and parse, as in

d = 5
for (i in 1:10){
     eval(parse(text = paste('a', 1:10, ' = d + rnorm(3)', sep='')[i]))
}