[R] List of lists

mohan.radhakrishnan at polarisft.com mohan.radhakrishnan at polarisft.com
Tue Jul 30 14:05:30 CEST 2013

               I am creating a list of 2 lists, one containing filenames
and the other file descriptors.  When I retrieve them I am  unable to close
the file descriptor.

I am getting this error when I try to call close(filedescriptors

Error in UseMethod("close") :
  no applicable method for 'close' applied to an object of class "c
('integer', 'numeric')"

print(filedescriptors[[2]][[1]]) seems to be printing individual elements.


filelist.array <- function(n){
  cpufile <- list()
  cpufiledescriptors <- list()
  length(cpufile) <- n
  for (i in 1:n) {
    cpufile[[i]] <- paste("output", i, ".txt", sep = "")
	cpufiledescriptors[[i]]<-file( cpufile[[i]], "a" )
    listoffiles <- list(cpufile=cpufile,
	return (listoffiles)

#Test function

test.filelist.array <- function() {
	filedescriptors <- filelist.array(3)


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