Introduction to R Programming
'R' is a programming language for data analysis and statistics. It is free, and very widely used by professional statisticians. It is also very popular in certain application areas, including bioinformatics. R is a dynamically typed interpreted language and is typically used interactively. It has many built-in functions and libraries, and is extensible, allowing users to define their own functions and procedures using R, C or Fortran. It also has a simple object system. R is case sensitive on its built-in libraries and functions, also to defined variables.