Message-ID: <9bb2e8c4-cfbd-89fb-0c92-826d229496cb@comcast.net>
Date: 2022-03-04T17:34:15Z
From: David Winsemius
Subject: copying huge strings via clipboard?
In-Reply-To: <778a0fb5-08a8-7611-1bb4-ad9dace55bca@witthoft.com>
On 3/4/22 08:45, Carl Witthoft wrote:
> Hi,
> This is on Windows10 via the R gui? .? I, admittedly inadvisably,
> tried to create a new character object by first copying a 1-million
> character string (including lead and trail "'" chars) to the clipboard
> and then, in the console,
>
> >> foo <-
> and hitting "paste"
>
> What I found is that, around 5000 characters, a newline ( "\n") char
> showed up.? Is this something that the Windows Clipboard does, or
> something odd about pasting into a command in R?
I'm the wrong person to comment on Windows clipboard features.
ISTR that there is a character limit for R command line input, at least
in some or perhaps all R installations.
Subject: [R] parsing -?input?buffer overflow
<http://markmail.org/message/iyjlmfsb4kp63cyi> permalink
<http://markmail.org/message/iyjlmfsb4kp63cyi>
From: Prof Brian Ripley (rip... at stats.ox.ac.uk)
Date: Jun 13, 2008 1:52:06 am
List: org.r-project.r-help
"R does have limits on the command line length (1024 bytes up to
R-devel, 4096 bytes there). What happens if you exceed that depends on
the interface you are using (and you have not told us). Beyond that, the
parser has a limit of MAXELTSIZE (8192 bytes) on strings.
I don't see any need for 'improvement' though: why are you entering very
long strings as part of the R program? They are data, and e.g.
readLines() and scan() have no limits on string length beyond those
imposed by R's internals (2^31-1 bytes)."
I think that info is still current since a search of the
../manuals/R-int page says:
--- copied
The|R_StringBuffer|structure needs to be initialized, for example by
static R_StringBuffer ex_buff = {NULL, 0, MAXELTSIZE};
which uses a default size of|MAXELTSIZE = 8192|bytes.Most current uses
have a static|R_StringBuffer|structure, which allows the (default-sized)
buffer to be shared between calls to e.g.|grep|and even between
functions: this will need to be changed if R ever allows concurrent
evaluation threads.
--- end copy
--
David
>
> Postscript:? using
>
> >>? bar <- readChar('thefile.txt',1e6)
>
> the import works perfectly.
>
>