use "mean" on some columns of a data frame

General
1

hi, i'm trying to calculate the mean of all the rows for some columns in a data frame.
so in the end, i will have a new data frame with the just the columns i want and each column will have just the mean of all its rows.
thanks you !

2 
library(tidyverse)

summarise(mtcars,
          across(c("cyl","disp","hp"),
                 .fns = ~mean(.x,na.rm=TRUE)))
3

Just to add to nirgrahamuk tidyverse method, te base version would be

rowMeans(mtcars[, c("cyl","disp","hp")])
4

It works, thanks a lot !!

5

thank you very much sir !

6

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