Learning R - some basics

Learning R part 2

R is an object-oriented language with every object having a type (and being a member of a class)

*** What is R written in ?

R itself, c and fortran (autoconf, shell script)

http://blog.revolutionanalytics.com/2011/08/what-language-is-r-written-in.html

though some R packages are in c++, Perl, etc

*** basics

> R 

starts everything

>q()

quits

>help()

will give you some help


***** basic math funcs

>exp(1)

2.71828182845905

***** range of numbers

> x <- 1:3

| 1 |
| 2 |
| 3 |

***** define functions

> x <- 1:5
> square <- function(x) {
>   x^2
> }
> square(x)

|  1 |
|  4 |
|  9 |
| 16 |
| 25 |

***** easy to define vector (arrays) and get specific member

> b <- c(1,2,3,4,5,4343,7,8,9,10,11,12)
> b[6] 

4343