On Tue, 1 Feb 2005, Hsiu-Khuern Tang wrote:
Is there a limit on the number of characters in an invocation like
R CMD BATCH --opt1=val1 --opt2=val2 ... --save-to=C:\very\long\string ..\R\script.R
?
Yes, but that is not a valid invocation of R.
I am running R 2.0.1 on Windows XP, and when running a long BATCH command (about 400--500 characters) the last option gets mangled, as can
There is a Windows limit on the length of command lines, and I believe you have hit it. It looks like R.exe/Rcmd.exe were written assuming it is MAX_PATH, hence about 260, which it used to be in Win95.
You could use
rterm --args --opt1=val1 --opt2=val2 ... --save-to=C:\very\long\string < foo > bar
instead: BATCH is just a convenient shorthand (and see the rw-FAQ for the details).
Shells also have limits, so check this for the one you used.
be seen from a warning in script.Rout that looks like this:
WARNING: unknown option +--save-to=C:\very\long\str..\R\script.Rout
Note that "string" is truncated to "str" _and_ concatenated with the implicit batch output file "..\R\script.Rout". (The "unknown option" warning is expected; I am just using commandArgs() within the script to pick out the arguments.)
I have tried specifying --args before the options, with the same result, except that the truncation appears earlier.
--args would be needed for this to make any sense.
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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