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Programmers looking for an extensible tool for statistical analysis and graphic
techniques will want to investigate "R," a free product similar
to the S language.
R is a computer language that allows users to add additional functionality
by defining new functions, and link C, C++, and Fortran code for intensive computational
tasks.
With R, programmers can produce well-designed publication-quality plots, including
mathematical symbols and formulae where needed, while retaining full control
over the design. Examples of R screenshots and graphics, including three-dimensional
plots, are displayed at http://www.r-project.org/
under "Screenshots."
For more information about R, go to the R Project site at http://www.r-project.org/ The site offers a general overview of the project, as well as downloads, FAQs and manuals, bug tracking, and a developer page.