How to get the Index of Specified Item in a Vector in R

How to get the Index of Specified Item in a Vector in R ?

To get the index of a specified item in a vector in R, you can use the which() function.

In this example,

We have a numeric vector named num_vec.
We use the which() function along with equality comparison to find the index of the specified item.
We assign the index to a variable named index.
Finally, we print the index to standard output.

num_vec <- c(1, 2, 3, 4, 5)
item <- 3
index <- which(num_vec == item)
print(index)

[1] 3

In this example,

We have a character vector named char_vec.
We use the which() function along with equality comparison to find the index of the specified item.
We assign the index to a variable named index.
Finally, we print the index to standard output.

char_vec <- c("apple", "banana", "cherry", "date")
item <- "banana"
index <- which(char_vec == item)
print(index)

[1] 2

In this tutorial, we learned How to get the Index of Specified Item in a Vector in R language with well detailed examples.