[R] List of lists

mohan.radhakrishnan at polarisft.com mohan.radhakrishnan at polarisft.com
Wed Jul 31 08:18:30 CEST 2013

Hi Jim,


  I might be doing something wrong. Error is

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


   Re: [R] List of lists                                                    
   Jim Lemon                                                                
                 mohan.radhakrishnan, R-help at r-project.org                  
                                                           31-07-2013 03:05 

On 07/30/2013 10:05 PM, mohan.radhakrishnan at polarisft.com wrote:
> Hi,
>                 I am creating a list of 2 lists, one containing filenames
> and the other file descriptors.  When I retrieve them I am  unable to
> the file descriptor.
> I am getting this error when I try to call close(filedescriptors
> [[2]][[1]]).
> 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
> Thanks,
> Mohan
> 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,
> cpufiledescriptors=cpufiledescriptors)
> 		 return (listoffiles)
> }
> #Test function
> test.filelist.array<- function() {
> 		 filedescriptors<- filelist.array(3)
>      print(filedescriptors[[2]][[1]])
>      print(filedescriptors[[2]][[2]])
>      print(filedescriptors[[2]][[3]])
> }
Hi Mohan,
When you have opened connections as above, you need to pass the
connection, not just one element, to "close":



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