[R] Use R in a pipeline as a filter

[Dirk Eddelbuettel]

On 7 June 2007 at 14:27, mw-u2 at gmx.de wrote:
| how can I use R in a pipline like this
| 
|  $ ./generate-data | R --script-file=Script.R | ./further-analyse-data > result.dat

The 'r' in our 'littler' package can do that. One example we show on the
littler webpage is

	$ ls -l /boot | awk '!/^total/ {print $5}' | \
		 r -e 'fsizes <- as.integer(readLines());
			print(summary(fsizes)); stem(fsizes)'

We use R's readLines to read from stdin, and you can of course also have r
'in the middle' if you take care of the output generated -- which our example
doesn't do as it prints straight to screen.

Dirk

-- 
Hell, there are no rules here - we're trying to accomplish something. 
                                                  -- Thomas A. Edison