List in R language

               List  in R

1. Creating a list         we use list function to create list 

2. Assign name  to the list elements with the help of names() function.

3. Print the list data

How to acces R list elements ? .

1. Indexing method            ex .  print(list_data[1])  

2. Usings names                ex . print(list_data(student))

# creating a list containing  strings , number , vector . and a logical values .

 List_data <- list(“Ram”, “Sham” , c(1,2,3), TRUE , 1.03 )

 

 print(List_data)

 

Output:

[[1]]

[1] "Ram"

[[2]]

[1] "Sham"

[[3]]

[1] 1 2 3

[[4]]

[1] TRUE

[[5]]

[1] 1.03

# creating list containing a vector , a matrix and a list .

  

   List_data1 <- list(c(“ram”,”sham”,”raj” ) , matrix(c(40,60,70,80,30,20), nrow=2), 

                                list(“BCA”,”MCA”,”BSc”))

# Giving names to the elements in the list 

 names(List_data1) <- c(“Students”, “Marks” , “Course”)

#show list

print(List_data1)

#adding element at the end of the list (use append function )

List_data1 <- append(List_data1, "mumbai")  # Appends "mumbai" to the end of the list

#adding data at specific position 

List_data1[4] <- “pune”         

# removing the last element 

  List_data1[5]<- NULL 

# Updating the 3rd Element 

  

  List_data1[3] <- “BCA science”

 print(List_data1[3]

• create a list of character strings and print it:

# Create a list of character strings

list_pdata <- list("Ram Sharma", "Varma", "Raj Jadhav", "Pratik ")

# Print the list

print(list_pdata)

[[1]]

[1] "Ram Sharma"

[[2]]

[1] "Varma"

[[3]]

[1] "Raj Jadhav"

[[4]]

[1] "Pratik SSFGSSFGDJN"

# Add a new element by assigning it to a new index

 list_pdata[[5]] <- "Another Person"

# Remove the second element list_pdata[[2]] <- NULL

list_pdata <- list_pdata[-2]

# print ing the 3rd element 

print(list_pdata[3]) 

#creatinjg lists 

list1<- list(1:5)

print(list1)

output:

[[1]]

[1] 1 2 3 4 5

 list2 <- list(11:15)

 print(list2)

#convert list to vector 

V1 <- unlist(list1)

V2 <- unlist(list2)

print(v1)

[1] 1 2 3 4 5

 print(V2)

[1] 11 12 13 14 15

#ADDING a vector 

Result <- v1+v2 

Print (result)

[1] 12 14 16 18 20

# merge list 

> MergedList1 <- c(list1, list2)

> print(MergedList1)

[[1]]

[1] 1 2 3 4 5

[[2]]

[1] 11 12 13 14 15

# Define two lists

List1 <- list("Ram", "Sham", c(1, 2, 3))

List2 <- list(TRUE, 1.03, "pune")

#merge two list 

# Method 1: Using c()

MergedList1 <- c(List1, List2)

print(MergedList1)

Output:

[[1]]

[1] "Ram"

[[2]]

[1] "Sham"

[[3]]

[1] 1 2 3

[[4]]

[1] TRUE

[[5]]

[1] 1.03

[[6]]

[1] "pune"

# Method 2: Using append()

MergedList2 <- append(List1, List2)

print(MergedList2)

# Method 3: Using unlist() and list()

MergedList3 <- list(unlist(c(List1, List2)))

print(MergedList3)

Output:

[[1]]

[1] "Ram"  "Sham" "1"    "2"    "3"    "TRUE" "1.03" "pune"

# Method 4: Using Map()

MergedList4 <- Map(c, List1, List2)

print(MergedList4)

Output:

[[1]]

[1] "Ram"  "TRUE"

[[2]]

[1] "Sham" "1.03"

[[3]]

[1] "1"    "2"    "3"    "pune"