# Ctrl + R to execute the code
# Ctrl + L to delete the R console
# putting # on the left of any thing will make it a comment


1+1# this is how you add up different numbers
2*2

1+1 
#
2+2


1+1  *	2+2

## vector is an unidimensional

a <- 1 ## this is how you create a vector
a

a <- 1:5 ## vector with consecutive numbers
a


a <- c(1,3,5) ## vector with different numbers c means "combine"
a

b <- "a" # put "" around character
b

b <- c("a","b","c","abc")
b

# this is how you check the property of a vector
class(a)# numeric
class(b)# character

c <- factor(c(1,2,3))# factor; different type of property

is.numeric(a)# questions if it's a numeric
a <- as.character(a)# converts into character

d <- c(1,2,3,"Subhojit")## character has priority

name <- c("A","B","C","D","E","F","G","H","I","J")
age <- c(22,43,12,17,29,5,51,56,9,44)
sex <- c("M","F","M","M","M","F","F","M","F","F")

undertaker <- data.frame(name,age,sex,stringsAsFactors=FALSE)
undertaker

str(undertaker)# view the properties

#data frame name $ variable name

undertaker$name <- as.character(undertaker$name)
undertaker$sex <- as.character(undertaker$sex)

rock <- undertaker