[R] New project: littler for GNU R

[Dirk Eddelbuettel]

On 26 September 2006 at 22:17, Gabor Grothendieck wrote:
| The real problem is that one wants to pipe the data in, not the
| R source.  The idea is that one successively transforms the
| data in successive elements of the pipeline.

But that is what our filesize example does::

| On 9/26/06, Duncan Murdoch <murdoch at stats.uwo.ca> wrote:
| > On 9/26/2006 1:04 PM, Jeffrey Horner wrote:
[...]
| > >    But unlike bc(1), GNU R has a vast number of statistical
| > >    functions. For example, we can quickly compute a summary() and show
| > >    a stem-and-leaf plot for file sizes in a given directory via
| > >
| > >          $ ls -l /boot | awk '!/^total/ {print $5}' | \
| > >               r -e 'fsizes <- as.integer(readLines());
| > >                  print(summary(fsizes)); stem(fsizes)'
| > >             Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
| > >               13     512  110100  486900  768400 4735000
| > >          Loading required package: grDevices
| > >
| > >            The decimal point is 6 digit(s) to the right of the |
| > >
| > >            0 | 00000000000000000011112223
| > >            0 | 5557778899
| > >            1 | 112233
| > >            1 | 5
| > >            2 |
| > >            2 |
| > >            3 |
| > >            3 |
| > >            4 |
| > >            4 | 7

Data to be processed on stdin, command via -e 'some long expression'.

To make it simpler, here is a somewhat useless example of r piping into r
(which I've indented for readability):

  $  r -e 'set.seed(42); sapply(rnorm(5),function(x) cat(x,"\n"))' |  \
		 r -e 'cat(sum(abs(as.numeric(readLines()))), "\n")'
  3.335916

Isn't that something where, to quote you, "one wants to pipe the data in, not
the R source" ?  

Dirk

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