Extract a single dplyr tbl_df row as a vector

Using the dplyr %>% operator

library(dplyr)
as_tibble(mtcars) %>%
           slice(2) %>% 
           unlist(., use.names=FALSE)

Or we can use c with recursive=TRUE

as_tibble(mtcars) %>%
          slice(2) %>% 
          c(., recursive=TRUE) %>%
          unname

From Introduction to dplyr: "All of the dplyr functions take a data frame (or tibble) as the first argument." So no need to convert mtcars into a tibble. Furthermore, as.numeric() is more concise than unlist(., use.names = FALSE).

library(dplyr)
mtcars %>%
  slice(2) %>%
  as.numeric()