[R] How is a file descriptor stored ?

[Jan van der Laan]

I don't know how many files you are planning to open, but what you  
also might run into is the maximum number of connections namely 125.  
See ?file.

Jan



mohan.radhakrishnan at polarisft.com schreef:

> Hi,
>         I thought that 'R' like java will allow me to store file names
> (keys) and file descriptors(values) in a hashmap.
>
>
> filelist.array <- function(n){
>   sink("nmon.log")
>   cpufile <- new.env(hash=T, parent=emptyenv())
>   for (i in 1:n) {
>     key <- paste("output", i, ".txt", sep = "")
>     assign(key, file( key, "w" ), cpufile)
>   }
>     sink()
>    return (cpufile)
> }
>
> But when I try to test it like this there is an exception
>
> [1] "Exception is  Error in UseMethod(\"close\"): no applicable method for
> 'close' applied to an object of class \"c('integer', 'numeric')\"\n"
>
> test.simple.filelist.array <- function() {
>
>     execution <- tryCatch({
> 		sink("nmon.log")
> 		listoffiles <- filelist.array(3)
> 		for (v in ls(listoffiles)) {
> 			print(paste("Map value is [", listoffiles[[v]], "]"))
> 			fd <- listoffiles[[v]]
> 			close(fd)
> 		}
>         sink()
> 	}, error = function(err){
> 		print(paste("Exception is ",err))
> 	})
> }
>
> I think I am missing some fundamentals.
>
> Thanks,
> Mohan
>
>
>
>
>
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