[R] command line limit?
dederderian at micron.com
Tue Mar 25 18:08:00 CET 2003
Sorry, I thought I was replying to R-help.
Anyways, you were correct. I had already tried inserting a couple "\n"'s into the comfile with no luck. I was still receiving the same error. After your suggestion I inserted even more and it worked.
Regarding the suggestion of calling source(comfile), I didn't want to have to create a second comfile just to call another comfile. Your suggestion would have worked though. Knowing the actual limit is ~1022 is good info. Now I can build that limit into my perl script.
Thanks for your help.
From: Prof Brian D Ripley [mailto:ripley at stats.ox.ac.uk]
Sent: Tuesday, March 25, 2003 9:57 AM
Cc: 'Martin Maechler'; 'r-help at stat.math.ethz.ch'
Subject: RE: [R] command line limit?
On Tue, 25 Mar 2003, dederderian wrote:
> Very insightful. Thanks Martin.
> Maybe, I need to explain my problem a little better.
Yes, please do: you seem to be talking about console input lines, not the
command line at all.
> I am creating an R comfile within a perl script.
> When I run this R comfile using:
> It works fine.
> When I run it from within my perl script using:
> R --no-save < Rcomfile.txt
> It does not work.
> I receive this error message in the middle of a long command line:
> Error: syntax error
> Execution halted
> I only see this problem when I have really "long" command lines within the comfile.
> I don't really have a work around for getting rid of my long command lines so I would like to find a way to make this work.
Why can't you call source() in Rcomfile.txt?
AFAIK there is a 1022 char limit on input lines at the console, including
redirected. From src/unix/system.txt
* 2. CONSOLE I/O
* The first group of functions is concerned with reading and
* writing to the system console.
* int R_ReadConsole(char *prompt, char *buf, int buflen, int hist)
* This function prints the given prompt at the console and then
* does a gets(3)-like operation, transferring up to "buflen" characters
* into the buffer "buf". The last two characters are set to "\n\0"
* to preserve sanity.
and buflen is 1024 in src/main/main.c
Brian D. Ripley, ripley at stats.ox.ac.uk
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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