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Re: [R] New project: littler for GNU R

Gabor Grothendieck

2006-09-26

Replies:

Any plans for Windows?

On 9/26/06, Jeffrey Horner <jeff.horner@(protected):
>
> 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
>
>  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)
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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.
>

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