Create a variable name with "paste" in R?

See below:

paste("perf.a", "1", sep="")
# [1] "perf.a1"

What if I want to assign a value to perf.a1?

I tried as.name, as.symbol, etc., with no avail:

as.name(paste("perf.a", "1", sep="")) = 5
# Error in as.name(paste("perf.a", "1", sep = "")) = 5 : 
#   target of assignment expands to non-language object
as.symbol(paste("perf.a", "1", sep="")) = 5
# Error in as.symbol(paste("perf.a", "1", sep = "")) = 5 : 
#   target of assignment expands to non-language object
noquote(paste("perf.a", "1", sep="")) = 5
# Error in noquote(paste("perf.a", "1", sep = "")) = 5 : 
#   target of assignment expands to non-language object

Solution 1:

You can use assign (doc) to change the value of perf.a1:

> assign(paste("perf.a", "1", sep=""),5)
> perf.a1
[1] 5

Solution 2:

See ?assign.

> assign(paste("tra.", 1, sep = ""), 5)
> tra.1
  [1] 5