basic r

creating a vector:

c(1, 2,3)

this is a vecotr include 1,2,3

c('a','b')

this is a vector includes a and b

seq(5,9)

creates sequence of data from 5 to 9

5:9

is like the above code

seq( 5, 9, 0.5) create a vector from 5 to 9 with .5 interval