return named list from foreach

You cannot do that in one step. Do it right after:

names(out) <- df$nm

Please don't post using HTML format.. it scrambles code, and since we cannot see what you saw it doesn't help in any way.

Also note that "df" is a function in the base stats package... not a good name to use.

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Hello all,

I've been trying to figure out how to return a named list from foreach.

Given that the order of the returned list is guaranteed to be in the 
order in which the object is passed to foreach, list members can be 
named afterwards.  However, I'm wondering if there's a better way to do

it, perhaps with some sort of combine function?

   library(doParallel)
   library(foreach)

   cl <- makeCluster(4)
   registerDoParallel(cl)

   df = data.frame(nm = letters[11:20], a = 1:10, b=11:20)

   out = foreach(i=1:nrow(df)) %dopar% {
        a = list(j = sqrt(df[i,]$a), k = sqrt(df[i,]$b))
        a
   }

How do I name the elements of "out" using the corresponding values
df$nm?

thanks,
allie

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