Example:
myfunction <- function(mydata, myvariables, prefix="norm_"){
newnames <- paste(prefix, myvariables, sep="")
mydata[newnames] <- scale(mydata[myvariables])
mydata
}
mydata <- data.frame(a=1:2, b=3:2)
myfunction(mydata, c("a", "b"))
Moira Burke wrote:
Hi. I'm a new R user and think what I'm trying to do is pretty basic, but
haven't been able to find the answer in the mailing list archives. How do I
write a function that creates new variables in a given data.frame with a
prefix attached to the variable names? I do a lot of repetitive logging and
scaling of variables, and would like a way to consistently generate and name
versions of the variables.
The function would take a data.frame, an array of variables, and a prefix
string. It performs a transformation on the variables (e.g. logs and
scales), and creates new variables with the same names as the inputs, but
with the prefix_string prepended.
So, a sample call would look like:
myfunction(mydata, myvariables, "norm_")
And if myvariables contained variables named "var1", "var2", etc., the
function would generate:
mydata$norm_var1
mydata$norm_var2
Thanks,
Moira
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