how to use select for multiple fields using dplyr

Question

I have a character vector of field names that I want to select using dplyr. I'm using the underscore version of select_().

select(mtcars, mpg)                   # works OK
select(mtcars, mpg, disp, am)         # works OK for multiple fields

now let's use the underscore version

fie <- c("mpg")             
select_(mtcars, fie)                  # works OK for one
fie <- c("mpg", "disp", "am")
select_(mtcars, fie)                  # problem:  only returns one column
select_(mtcars, ~fie)                 # problem:  doesn't work

I'm confused as to how to get this to work. Any suggestions? Thanks

Answer 1

If you use select:

select(mtcars, one_of(fie))