Variables in R

Writen by Chai Biscuit 2:20 AM - 0 Comments

                                                         VARIABLES IN R

What are Variables?:

Variables are reserved memory locations to store values.

Rules for variableName in R:

A valid variable name consists of letters, numbers and the dot or underline characters. The variable name starts with a letter or the dot not followed by a number.

Ex:

var_name%	Invalid	Has the character '%'. Only dot(.) and underscore allowed.
2var_name	invalid	Starts with a number
.2var_name	invalid	The starting dot is followed by a number making it invalid.
_var_name	invalid	Starts with _ which is not valid

Variable Assignment:

The variables can be assigned values using leftward, rightward and equal to operator.

# Assignment using equal operator.

var.1 = c(0,1,2,3)          

# Assignment using leftward operator.

var.2 <- c("learn","R")  

# Assignment using rightward operator.  

c(TRUE,1) -> var.3   

The cat() combines multiple items into a continuous print output.

var.1=c(1,2,3)

cat(var.1)

var.2<-c("learn","R")

cat(var.2)

o/p:  1 2 3learn R

Finding Variables:

1.Print(ls())  #To know all the variables currently available in the workspace

2.Print(ls(pattern=”var”)) #List the variables starting with the pattern 

The variables starting with dot(.) are hidden, they can be listed using "all.names = TRUE" argument to ls() function.

print(ls(all.names=TRUE))

Deleting Variables:

1.       rm(var_name)
All the variables can be deleted by using the rm() and ls() function together.

2.       rm(list=ls())

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