How to transpose a dataframe in tidyverse?

问题

Using basic R, I can transpose a dataframe, say mtcars, which has all columns of the same class:

as.data.frame(t(mtcars))

Or with pipes:

library(magrittr)
mtcars %>% t %>% as.data.frame

How to accomplish the same within tidyr or tidyverse packages?

My attempt below gives:

Error: Duplicate identifiers for rows

library(tidyverse)
mtcars %>% gather(var, value, everything()) %>% spread(var, value)

回答1:

Try with add_rownames

add_rownames(mtcars) %>% 
         gather(var, value, -rowname) %>% 
         spread(rowname, value) 

In the newer version, rownames_to_column replaces add_rownames

mtcars %>%
   rownames_to_column %>% 
   gather(var, value, -rowname) %>% 
   spread(rowname, value) 

来源：https://stackoverflow.com/questions/40306280/how-to-transpose-a-dataframe-in-tidyverse