I have a for loop:
for (i in 1:10){ Ai=d+rnorm(3)}
What I would like to do is have A1, A2,A3...A10 and I have the variable i in the variable name.
It doesn't work this way, but I'm probably missing some small thing. How can I use the i in the for loop to assign different variable names?
d <- 5
for(i in 1:10) {
nam <- paste("A", i, sep = "")
assign(nam, rnorm(3)+d)
}
A [i, i]) or a list (A [[i]][i]) - much easier than get (paste0 ("x", i))[i]. Plus you can easily assign new values for the matrix and list versions, but for the get/assign version you'd need a temporary variable.
fortunes::fortune(236): The only people who should use the assign function are those who fully understand why you should never use the assign function. -- Greg Snow R-help (July 2009)
i and nam variables?rm(nam) at the end just for cleanup? You're a legend, thanks. This works exactly as hoped :)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]))
}
You can try this:
for (i in 1:10) {
assign(as.vector(paste0('A', i)), rnorm(3))
}
assign:for (i in 1:10){ assign(paste("A",i, sep=""), (d + rnorm(3))) }get:for (i in 1:10) { print(get(paste("A", i, sep=""))) }