Dear R-help,
I have one more question about the functions mentioned in the subject.
Again, the system info is:
platform i386-pc-mingw32
arch x86
os Win32 (OK, it's NT4sp6)
system x86, Win32
status
major 1
minor 3.1
year 2001
month 08
day 31
language R
I defined a function like the following:
myfun <- function(file, maxline) {
f.con <- file(file, open="rt")
on.exit(close(f.con))
while(length(readln <- readLines(f.con, 1)) > 0 ) {
## Do something with readln...
}
## Do something more...
}
This didn't work for me. It gave me an error at the while statement, saying
"NA where logical needed". I inserted a browser() right inside the
while
loop and have it step through the function. It seems to be stuck at the
first line of the file and never move down. This behaviour is different
from the call without the browser(). Anyone has ideas why this is the case?
What had worked for me is something like the following:
repeat {
readln <- readLines(f.con, 1)
if(length(readln) == 0) break
## do something...
}
Any suggestions are greatly appreciated.
Regards,
Andy
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