data wrangling mini course - dplyr

.R

# dplyr five verbs
# select columns mpg, hp, wt, cyl from mtcars dataframe
select(mtcars, mpg, hp, wt, cyl)

# select column 1 to 5, 8 and 9
select(1:5, 8, 9)

# remove column 9 and 10
select(-9, -10)

# use helper verbs in select
select(mtcars, starts_with("h"))
select(mtcars, ends_with("p"))
select(mtcars, contains("a"))