Dear R-users

I was running into problems with my R code trying to run clh sampling (clhs package) in parallel mode (=on various data sets simultaneously).

Here is the code (which I developed with some help:)):
******************************************
library("clhs")
library("snow")
a <- as.data.frame(replicate(1000, rnorm(20)))
b <- as.data.frame(replicate(1000, rnorm(20)))
c <- as.data.frame(replicate(1000, rnorm(20)))
d <- as.data.frame(replicate(1000, rnorm(20)))
abcd <- list(a, b, c, d)
cl <- makeCluster(4)
results <- parLapply(cl,
   X = abcd,
   FUN = function(i) {
     clhs(x = i, size = round(nrow(i) / 5), iter = 2000, simple = FALSE)
   },
)
stopCluster(cl)
******************************************

Before running the last line, R is throwing an error: "Error in length(x) : 'x' is missing". Any ideas what I am doing wrong and how to improve?

Many thanks!

Best, Chega
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