writing a function to calculate the mean of columns in a dataframe in R

Question

I have to calculate the mean of the columns in a dataframe by writing a function and then applying it. I understand that this is easy to do with mean and

Answer 1

Why not to use dplyr?

You can get the mean for all columns in your data.frame using

summarise_each(funs(mean))

If we apply it to mtcars

library(dplyr)
mtcars %>% summarise_each(funs(mean))

#       mpg    cyl     disp       hp     drat      wt     qsec     vs      am   gear   carb
#1 20.09062 6.1875 230.7219 146.6875 3.596563 3.21725 17.84875 0.4375 0.40625 3.6875 2.8125