Access the last value of a given vector in R
In this article, we will discuss how to access the last value of a given vector in R Programming Language. So let’s begin by first creating an example vector because to get the last value of a vector we need to first create the vector.
R
vec1 <- c ( "John" , "Smith" , "Tina" , "Brad" , "Emma" ) print (vec1) |
Output:
"John" "Smith" "Tina" "Brad" "Emma"
Our first vector is a character string with some names, now we have to extract the last name from this vector.
Method 1: Using length function
To do this task we can use the length() function from the R Language. This not only enables to find out the length of the string but also access to the elements.
Syntax: length(x)
Parameter: x: vector
Example:
R
vec1 <- c ( "John" , "Smith" , "Tina" , "Brad" , "Emma" ) length (vec1) |
Output:
[1] 5
Now, let’s use length() function to get the last element of the vector:
R
vec1 <- c ( "John" , "Smith" , "Tina" , "Brad" , "Emma" ) length (vec1) # To Extract last element with length vec1[ length (vec1)] |
Output:
[1] 5 [1] "Emma"
Method 2: Using Tail() function
To find the last element of the vector we can also use tail() function.
Again to demonstrate it let’s first create an example vector.
R
vec2 <- c (123 , 124 , 125 , 126, 128) print (vec2) |
Output:
123 124 125 126 128
We have an example vector, and we have to access its last element.
Syntax: tail()
Parameters:
- x: data frame
- n: number of rows to be displayed
Here we are passing n=1 so that it will display only the last element in the vector.
R
vec2 <- c (123 , 124 , 125 , 126) tail (vec2 , 1) |
Output:
126
Contact Us