On 08/04/2011 10:56 AM, Joris Meys wrote:
Dear all,I do not completely understand following behaviour : > con<- file("test.txt") > isOpen(con) [1] FALSE > open(con) > isOpen(con) [1] TRUE > close(con) > isOpen(con) Error in isOpen(con) : invalid connection > str(con) Classes 'file', 'connection' atomic [1:1] 3 ..- attr(*, "conn_id")=<externalptr> Why do I get an error, indicating an invalid connection, after I closed a connection? Is this to be expected?
Quoting ?close: " ‘close’ closes and destroys a connection. " In the current implementation, connections are a finite resource, and you need to be able to get rid of them when you are done. close(con) is the way to do that. If you want to re-open it, you need to remember the filename (or extract it before calling close()), and issue another call to file().
Duncan Murdoch ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
