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
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
>
> 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@(protected)>
> - Dirk Eddelbuettel <edd@(protected)>
>
> ______________________________________________
> R-help@(protected)
> 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.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
