Tutorial # 1. Data Type & Variable Declaration

 Variable Declaration :

Boolean Type :

a = TRUE

Number Type:

b=5.5

Capital L means this number has to be an Integer

c=6L

String Type Variable

ch =' Hello'

d = charToRaw('Hello World')

# 48 65 6c 6c 6f 20 57 6f 72 6c 64 This is the way how data is stored as row.

 print(d)

Gives the type of a variable 

typeof(a)

typeof(b)

typeof(c)

typeof(ch)

typeof(d)

Gives the data type of a variable

 

class(a)

class(b)

class(ch)

class(d)

In many computer programming languages to assigning a value to a variable 

we generally use "=" 

but in R instead of "=" we can we can also use "<-" but both of them are not same

 

num = 20

num <- 20

Example :

a =1:10

b <- 5:15

print(a)

print(b)

 

mean(x=1:10)

# can't print the value of x as it is a local variable within the mean function  

print(x)

mean(x<-5:15)

# now x is a global variable and can be used anywhere within the program. 

print(x)

You may also interested in:

An Introduction to language R

Tutorial # 1.Data Type & Variable  Declaration
Tutorial # 2.Operators
Tutorial # 3.Vector  & Element Access
Tutorial # 4.Matrix
Tutorial # 5.Data Frame

Tutorial # 6.Arrays
Tutorial # 7.Lists
Tutorial # 8.Factors
Tutorial # 9.Data import
Tutorial # 10.Machine Learning
Tutorial # 11.Visualization