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Obtaining Source Code For R 
!
www.r-project.org """" CRAN """" (select a 
repository) 
!
For R:  
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Obtaining Source Code For A Package
!
Load CRAN in 
browser
• Click “Packages” 
link
• 1700 objects 
including 
packages (as of 
2009-03-11)
Find the 
package of 
interest by first 
letter 
• click name 
12 / PDF Solutions Inc.
C# PDF Convert to Tiff SDK: Convert PDF to tiff images in C#.net
Using this .NET PDF to TIFF conversion control, C# developers can render and convert PDF document to TIFF image Both single page and multi-page Tiff image
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JPG to PNG Converter | Convert JPEG to PNG, Convert PNG to JPG
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“lme4” Package  
!
Package pages contain 
links to:
Package dependencies
• Package source
• Package binaries
• Reference manual
Archives for old source 
tarballs
• Maintainer contact info
• And, if applicable,
•Project URL
•Task Views
Vignettes
13 / PDF Solutions Inc.
C# TIFF: C#.NET Code to Convert JPEG Images to TIFF
transform & convert various image forms, like Jpeg, Png, Bmp, Gif, and REImage object to single or multi-page Tiff image Use C# Code to Convert Jpeg to Tiff.
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Open JPEG to Word Converter first; Load JPG images from local folders in "File" in toolbar Windows Explorer; How to Convert Single Word Image to JPEG.
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Using An Installed Package 
!
help(package = fortunes) or library(help = 
fortunes)
to get an overview of package capabilities 
!
library(fortunes) 
• to attach it as the second in the search path 
!
?fortune 
• to get ‘help’ on the function ‘fortune’
> fortune('RTFM')
This is all documented in TFM. Those who WTFM don't want 
to have to WTFM again on the mailing list. RTFM.
-- Barry Rowlingson
R-help (October 2003)
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“DierckxSpline” Package 
!
Click
• Download to your hard 
drive 
• Unzip
C# Imaging - Planet Barcode Generation Guide
bar codes on documents such as PDF, Office Word, Excel, PowerPoint and multi-page TIFF. BarcodeHeight = 200; barcode.AutoResize = true; //convert barcode to
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“DierckxSpline” Package Contents 
!
data sets 
!
files not checked by ‘R CMD check’
!
Help files 
!
R function definition files 
!
source code in Fortran, C, C++, ... 
!
Package description 
!
Names to be exported 
!
Not all packages have all of these 
!
Some packages have others  
!
Ultimate documentation = source code 
!
debug” function:  walk through R code line by line until 
we understand what it does;  “browser” for check points 
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Outline 
!
Installing R and R Packages 
!
Obtaining source code 
!
Creating R packages 
• Why? 
• How to create?  
How to check?  
• How to share?  
!
Establishing and Maintaining Local R Archive 
Networks 
!
Using Subversion (SVN) 
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Why Create R Packages
!
Productivity 
• Tripled my software development productivity overnight 
• Help file with examples first;  code to these examples 
“R CMD check” finds when new changes break previous 
tests 
• Version control 
!
Quality:  
• Examples = unit testing 
http://en.wikipedia.org/wiki/Unit_test
•Chambers’ “Prime Directive”:  Trustworthy software 
(2008) Software for Data Analysis (Springer) 
as well as documentation 
!
Easy to share results 
!
Easy to understand what I did a couple of years ago 
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How to Create an R Package 
!
Copy existing package(s) 
!
“package.skeleton” function 
!
“Writing R Extensions” manual 
• http://cran.r-project.org/doc/manuals/R-exts.pdf
!
Other references:
• Rossi, Peter (2006) Making R Packages under Windows
http://faculty.chicagogsb.edu/peter.rossi/research/bayes%20book/bayesm/Making%20R%20Packages%20Under%20W
, accessed 2008.11.02
Leisch, Friedrich (2008) Creating R Packages: A Tutorial
http://epub.ub.uni-muenchen.de/6175/
!
R-devel listserve (r-devel@stat.math.ethz.ch)
19 / PDF Solutions Inc.
Rolf Turner: In the middle of a Saturday morning (in my Time Zone!) I send out a plea for help, 
and in just over 20 minutes my problem is solved! I don't think you get service like that 
anywhere else. This R-help list is BLOODY AMAZING!
Spencer Graves: 'The sun never sets on the (former) British Empire.' Today, it never sets on 
R-Help.
-- Rolf Turner and Spencer Graves
R-help (May 2005)
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Package Directory Structure
!
packageName
• DESCRIPTION – describes the package contents
man – Rd help files
• R – R code files
• NAMESPACE – defines the package name space
• data – contains files with data (txt, csv, rda)
• inst – contents are copied to installed package
• src – C, Fortran code to compile with the package
• tests – R code for testing package functions
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See section 1.1 in “Writing R 
Extensions”
Required
Optional
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