Message-ID: <D5348801-EDBF-4195-83DA-840FEC544596@plessthan.com>
Date: 2009-05-11T15:57:28Z
From: Dennis Fisher
Subject: R errors when trying to read a file
Colleagues,
I have encountered a problem in version 2.9 of R, running in both
Vista and OS X. My code is quite lengthy but the critical line is:
if (file.exists(FILENAME)) readLines(FILENAME))
This triggers the error:
Error in file(con, "r") : cannot open the connection
Calls: readLines -> file
Execution halted
The file that it is reading is being created on the fly, then
eventually deleted. The conditional was used to ensure that the
readLines command would be executed only when the file existed.
Is it possible that the file is deleted AFTER the conditional is
evaluated but before the readLines command is executed? If so, is
there any means to prevent an error condition?
Any help will be greatly appreciated. Thanks.
Dennis
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-415-564-2220
www.PLessThan.com