On Sat, 17 Oct 2009, Seth Falcon wrote:
* On 2009-10-16 at 15:00 +0200 sj...@damtp.cam.ac.uk wrote:
I think Rscript has a problem running files that have mac encodings
for newline (^M rather than ^J on linux).
I think those are Mac conventions for end-of-line, not for newline.
Even in MacRoman encoding, Ctrl-M is carriage return and Ctrl-J is
newline aka linefeed..
If I source the file within R, it works okay:
source('j.R')
[1] "MEA_data/sernagor_new/CRX_P7_1.txt"
But if I run the file using Rscript on a linux box I get a strange
error message:
$ Rscript --vanilla j.R
"
Execution halted
I think you are right that Rscript is unhappy to handle files with CR
line terminators.
More accurately, R's parser is: this applies to R CMD BATCH and R
itself with redirection. The point is that the documentation says
that R commands have to be separated by newline or semicolon and CR is
neither. (See, e.g. R-intro section 1.8.)
It is also documented that text-mode connections (which source() uses)
map CR and CRLF to newline, so source() can accept CR-delimited files.
And the error message looks strange because it has CRs but not NLs in
it (since the input did) and presumably the terminal used replaces not
superposes characters.
What actually is claimed to be the bug here? There is no subject
line, and no clear statement. Is that Rscript gives an error, that
source() works or that the error message comes out mangled on a
particular terminal?
But IIUC, the purpose of Rscript is to enable R script execution on
unix-like systems like:
#!/path/to/Rscript --vanilla
print(1:10)
So then I'm not sure how useful it is for Rscript to handle such
files. Why not convert to a more common and portable line termination
for your R script files?
+ seth
--
Seth Falcon | @sfalcon | http://userprimary.net/user
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