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R – Create empty vector and append values

  • Last Updated : 29 Jul, 2021

In this article, we will discuss how to create an empty vector and add elements into a vector in R Programming Language. An empty vector can be created by simply not passing any value while creating a regular vector using the c() function.

Syntax:

c()

This will return NULL as an output.

Example:



R




# create an empty vector a
a=c()
 
# display it
print(a)

Output:

NULL

A nested empty vector can also be created in R programming language.

Example:

R




# create an empty nested
# vector a
a=c(c(),c())
 
# display it
print(a)

Output:

NULL

Adding values to an empty vector

Method 1: Using range

We can use range (:) operator to add elements to an empty vector



Syntax:

start_value:end_value

Example:

R




# create an empty vector a
a=c()
 
# display it
print(a)
 
# adding numbers from 1 to
# 20 to a vector
a=1:20
 
# display a
print(a)

Output:

NULL
 [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20

Method 2: Using another vector

For this a vector is first created empty and then a vector is assigned to it.

Example: 

R




# create an empty vector a
a=c()
 
# display it
print(a)
 
# adding names to vector which
# is empty
a=c('sravan','bobby','rohith','gnnaesh','gajji')
 
# display a
print(a)

Output:



NULL
[1] "sravan"  "bobby"   "rohith"  "gnnaesh" "gajji"  

Method 3: Using index

We can assign/fill values in an empty vector by using “[]” operator which is known as the index operator

Syntax:

vector_name[index_location]=data

where, vector_name is the name of the empty vector which is created

  • Index_location is the index value where particular element is located
  • Data is the value which is assigned to particular index location

Example 1:

R




# create an empty numeric
# vector a
a=c()
 
# display it
print(a)
 
# create an empty numeric
# vector b
b=c()
 
# display it
print(b)
 
# create an empty numeric
# vector d
d=c()
 
# display it
print(d)
 
# include numeric data into
# vector a insert value 10
# at location 1
a[1]=10
 
# insert value 20 at location 2
a[2]=20
 
# insert value 14.5 at location 3
a[3]=14.5
 
# insert value 89.000 at location 4
a[4]=89.000
 
# display vector a
print(a)
 
# include logical data into vector
# b at locations 1,2,3
b[1]=TRUE
b[2]=FALSE
b[3]=FALSE
 
# display vector b
print(b)
 
# include character data into vector
# d at locations 1,2,3
d[1]="Sravan"
d[2]="Bobby"
d[3]="pinkey"
 
# display vector
print(d)

 

 

Output:



 

NULL
NULL
NULL
[1] 10.0 20.0 14.5 89.0
[1]  TRUE FALSE FALSE
[1] "Sravan" "Bobby"  "pinkey"

 

We can insert all types of vectors in one empty vector.

 

Example 2:

 

R




# create an empty numeric
# vector a
a=c()
 
# display it
print(a)
 
 
# include all type of vector 
# data into vector a
a[1]="sravan"
a[2]=20
a[3]=14.5
a[4]=FALSE
 
# display vector a
print(a)

Output:

NULL
[1] "sravan" "20"     "14.5"   "FALSE" 

Method 4: Using append()

We can add data by using the append() function.



Syntax:

append(vector_name,value)

Where, vector_name is the name of the vector and value is the input value.

Example:

R




# create an empty numeric
# vector a
a=c()
 
# display it
print(a)
 
# append 10 using append()
# function
a=append(a,10)
 
# display
print(a)

Output:

NULL
[1] 10

We can also append multiple data using c() function

Syntax:

append(vector,c(value1,value2,.value n))

Example:

R




# create an empty numeric
# vector a
a=c()
 
# display it
print(a)
 
# append 10 elements from 1 to
# 10  using append() function
a=append(a,c(1:10))
 
# display
print(a)

Output:

NULL
 [1]  1  2  3  4  5  6  7  8  9 10



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