Looking at help for tempfile,
"tempfile" returns a vector of character strings which can be used as
names for temporary files.
and
For "tempfile" a character vector giving the names of possible
(temporary) files. Note that no files are generated by "tempfile".
try a file.create(t) after tempfile()
cheers,
Keith
Dan Tenenbaum wrote:
According to ?system2, I should be able to direct the output of STDERR to a
file by giving the filename as a character vector to the "stderr" argument.
But here is what happens.
Given a ruby script test.rb (with its executable bit set):
#!/usr/bin/env ruby
STDOUT.puts "stdout"
STDERR.puts "stderr"
And the following R code:
t <- tempfile()
res <- system2("./test.rb", stdout=TRUE, stderr=t)
stderr
res
[1] "stdout"
file.exists(t)
[1] FALSE
I would expect the file t to exist and contain "stderr", and I would expect
not to see "stderr" in the console.
Also, there is a typo in the man page - the command is listed as "system" in
the Description instead of "system2".
The reverse behavior does work correctly:
res <- system2("./test.rb", stdout=t, stderr="")
stderr
file.exists(t)
[1] TRUE
Thanks!
Dan
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