What is R Programing
R is a programming language and software environment for statistical analysis, graphics representation and reporting. R was created by Ross Ihaka and Robert Gentleman at the University of Auckland, New Zealand, and is currently developed by the R Development Core Team.
The core of R is an interpreted computer language which allows branching and looping as well as modular programming using functions. R allows integration with the procedures written in the C, C++, .Net, Python or FORTRAN languages for efficiency.
R is open source distributed by GNU,is widely used for statistical programming,Business intelligence,graphical presentation and reporting.it is #1 choice for data Scientist for data analyst and representation.Also R is good for Statistical calculation on arrays, lists, vectors and matrices.A tool for DATA analysis.
Local Environment Setup
R can be install on Window and Linux.
Window Environment : https://cran.r-project.org/bin/windows/base
Linux Installation :https://cran.r-project.org/bin/linux/
Type ‘demo()’ for some demos, ‘help()’ for on-line help, or
‘help.start()’ for an HTML browser interface to help.
Type ‘q()’ to quit R.
at R prompt to install the required package. For example, the following command will install plotrix package which is required for 3D charts.
> install.packages("plotrix")
R Command Prompt
When local Environment is set up then you can start using R by typing this command
$ R , this will launch R interpreter with > prompt’… then you can type your command.
> myString <- "Hello, World!" > print ( myString) [1] "Hello, World!"
first statement defines a string variable myString, where we assign (<-) a string “Hello, World!” and then next statement print() is being used to print the value stored in variable myString
R Script File
Mostly R program is written in Scripfile then execute it at the Window or LInux command prompt
by R interpreter called Rscript.
Let write a Scriptfile
# My program in R Programming
myString <- “Hello, World!”
print ( myString)
Save the above code in a file hello.R and execute it,
execute it at Window command prompt
$ Rscript hello.R
it produces the following result.
[1] “Hello, World!”
Comments
Comments are like helping text in your R program and will be ignored by the interpreter while executing your program. Single comment is written using # in the beginning of the statement as follows
# My first program in R Programming
Next Blog will be about R Data Types
Vectors, Lists, Matrices, Arrays, Factors and Data Frames
DataTask 