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The R6 package allows the creation of classes with reference semantics, similar to R's built-in reference classes. Compared to reference classes, R6 classes are simpler and lighter-weight, and they are not built on S4 classes so they do not require the methods package. These classes allow public and private members, and they support inheritance, even when the classes are defined in different packages.
The package allows one to compose general HTTP requests and provides convenient functions to fetch URIs, get & post forms, etc. and process the results returned by the Web server. This provides a great deal of control over the HTTP/FTP/... connection and the form of the request while providing a higher-level interface than is available just using R socket connections. Additionally, the underlying implementation is robust and extensive, supporting FTP/FTPS/TFTP (uploads and downloads), SSL/HTTPS, telnet, dict, ldap, and also supports cookies, redirects, authentication, etc.
The RInside packages makes it easier to have "R inside" your C++ application by providing a C++ wrapper class providing the R interpreter.
RM2 is a simple package that implements functions used in revenue management and pricing environments.
Utilities for ROC with uarray focus.
An ODBC database interface for R.
A SQLite database interface definition for communication between R and SQLite databases.
R functions implementing a standard Unit Testing framework, with additional code inspection and report generation tools
This package is a basic R interface to the zlib and bzip2 facilities for compressing and uncompressing data that are in memory rather than in files.
The Rcpp package provides R functions as well as C++ classes which offer a seamless integration of R and C++. Many R data types and objects can be mapped back and forth to C++ equivalents which facilitates both writing of new code as well as easier integration of third-party libraries. Documentation about Rcpp is provided by several vignettes included in this package, via the Rcpp Gallery site at http://gallery.rcpp.org, the paper by Eddelbuettel and Francois (2011, JSS), and the book by Eddelbuettel (2013, Springer). See citation("Rcpp") for details on the last two.