From: Gabor Grothendieck <ggrothendieck_at_gmail.com>

Date: Wed 27 Sep 2006 - 02:17:43 GMT

> Is there a technical reason that this couldn't work by modifying the

*> script that invokes R? That would avoid the r/R clash on MacOSX and
*

*> Windows. In Windows R is R.exe, not a script, so some adjustment would
*

*> be needed there, but that shouldn't be difficult.
*

> Duncan Murdoch

*> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
*

*> > and provide commented, minimal, self-contained, reproducible code.
*

*> 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
*

*> and provide commented, minimal, self-contained, reproducible code.
*

>

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 and provide commented, minimal, self-contained, reproducible code. Received on Wed Sep 27 12:20:50 2006

Date: Wed 27 Sep 2006 - 02:17:43 GMT

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.

For example one might want to write cut, grep, etc. in R rather than in C.

This has been on my year-end wishlist for some time.

On 9/26/06, Duncan Murdoch <murdoch@stats.uwo.ca> wrote:

> On 9/26/2006 1:04 PM, Jeffrey Horner wrote:

*> > What ?
**> > ======
**> >
**> > littler - Provides hash-bang (#!) capability for R (www.r-project.org)
**> >
**> >
**> > Why ?
**> > =====
**> >
**> > GNU R, a language and environment for statistical computing and
**> > graphics, provides a wonderful system for 'programming with data'
**> > as well as interactive exploratory analysis, often involving graphs.
**> >
**> > Sometimes, however, simple scripts are desired. While GNU R can
**> > be used in batch mode, and while so-called 'here' documents can be
**> > crafted, a long-standing need for a scripting front-end has often
**> > been expressed by the R Community.
**> >
**> > littler (pronounced 'little R' and written 'r') aims to fill
**> > this need.
**> >
**> > It can be used directly on the command-line just like, say, bc(1):
**> >
**> >
**> > $ echo 'cat(pi^2,"\n")' | r
**> > 9.869604
*

>

> Is there a technical reason that this couldn't work by modifying the

>

> Duncan Murdoch

>

> >

> > Equivalently, commands that are to be evaluated can be given on

> > the command-line> >> > $ r -e 'cat(pi^2, "\n")'> > 9.869604> >> > 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> >> >> > And, last but not least, this (somewhat unwieldy) expression can> > be stored in a helper script:> >> > $ cat examples/fsizes.r> > #!/usr/bin/env r> >> > fsizes <- as.integer(readLines())> > print(summary(fsizes))> > stem(fsizes)> >> > (where calling /usr/bin/env is a trick from Python which allows one> > to forget whether r is installed in /usr/bin/r, /usr/local/bin/r,> > ~/bin/r, ...)> >> > A few examples are provided in the source directories examples/> > and tests/.> >> > Where ?> > =======> >> > littler can either be downloaded from> >> > http://biostat.mc.vanderbilt.edu/LittleR> >> > accessed by anonymous SVN:> >> > $ svn co http://littler.googlecode.com/svn/trunk/ littler> >> > or (soon !) be gotten from Debian mirrors via> >> > $ agt-get install littler> >> > littler is known to build and run on Linux and OS X.> >> >> > Who ?> > =====> >> > Copyright (C) 2006 Jeffrey Horner and Dirk Eddelbuettel> >> > littler is free software; you can redistribute it and/or modify it> > under the terms of the GNU General Public License as published by> > the Free Software Foundation; either version 2 of the License, or> > (at your option) any later version.> >> > This program is distributed in the hope that it will be useful,> > but WITHOUT ANY WARRANTY; without even the implied warranty of> > MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU> > General Public License for more details.> >> > You should have received a copy of the GNU General Public> > License along with this program; if not, write to the Free> > Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,> > MA 02111-1307 USA> >> > Comments are welcome, as are are suggestions, bug fixes, or patches.> >> >> > - Jeffrey Horner <jeff.horner@vanderbilt.edu>> > - Dirk Eddelbuettel <edd@debian.org>> >> > ______________________________________________> > R-help@stat.math.ethz.ch mailing list> > https://stat.ethz.ch/mailman/listinfo/r-help

>

> ______________________________________________

>

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Wed Sep 27 12:20:50 2006

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