Is there a way to stream data into R so that it can be used in a
command pipe?
Most Unix commands read data via standard input and read the script
from the command line. For example:
$ seq 1 10 | sed -e 's/^/foo /'
$ seq 1 10 | awk '{print "foo " $1}'
$ seq 1 10 | perl -lane 'print "foo $F[0]"'
In contrast, R seems to read the script from standard input, thereby
preventing streaming data through that file descriptor. In reading
through the man page for R and R-intro.html I haven't seen anything
obvious to change this behaviour. Is it possible?
Pointers to references would be greatly appreciated.
Regards,
- Robert
http://www.cwelug.org/downloads
Help others get OpenSource software. Distribute FLOSS
for Windows, Linux, *BSD, and MacOS X with BitTorrent
Try this on Windows or the corresponding ls command on UNIX:
readLines(pipe("cmd /c dir"))
On 5/10/06, Robert Citek <rwcitek at alum.calberkeley.org>
wrote:>
> Is there a way to stream data into R so that it can be used in a
> command pipe?
>
> Most Unix commands read data via standard input and read the script
> from the command line. For example:
>
> $ seq 1 10 | sed -e 's/^/foo /'
> $ seq 1 10 | awk '{print "foo " $1}'
> $ seq 1 10 | perl -lane 'print "foo $F[0]"'
>
> In contrast, R seems to read the script from standard input, thereby
> preventing streaming data through that file descriptor. In reading
> through the man page for R and R-intro.html I haven't seen anything
> obvious to change this behaviour. Is it possible?
>
> Pointers to references would be greatly appreciated.
>
> Regards,
> - Robert
> http://www.cwelug.org/downloads
> Help others get OpenSource software. Distribute FLOSS
> for Windows, Linux, *BSD, and MacOS X with BitTorrent
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>
You can use the pipe command to read data:
msci <- read.table(pipe("python
steve/python/msciintl.py"),sep=",",header=T,
as.is=T)
I use this metaphor quite a bit for loading data.
Steve Miller
-----Original Message-----
From: r-help-bounces@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Robert Citek
Sent: Wednesday, May 10, 2006 9:02 PM
To: r-help@stat.math.ethz.ch
Subject: [R] R more Unix-like?
Is there a way to stream data into R so that it can be used in a
command pipe?
Most Unix commands read data via standard input and read the script
from the command line. For example:
$ seq 1 10 | sed -e 's/^/foo /'
$ seq 1 10 | awk '{print "foo " $1}'
$ seq 1 10 | perl -lane 'print "foo $F[0]"'
In contrast, R seems to read the script from standard input, thereby
preventing streaming data through that file descriptor. In reading
through the man page for R and R-intro.html I haven't seen anything
obvious to change this behaviour. Is it possible?
Pointers to references would be greatly appreciated.
Regards,
- Robert
http://www.cwelug.org/downloads
Help others get OpenSource software. Distribute FLOSS
for Windows, Linux, *BSD, and MacOS X with BitTorrent
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
[[alternative HTML version deleted]]