renaming column name.R

library(tidyverse)
library(nycflights13)
dim(flights)
flights
slice(flights, 87:96)
top_n(flights,20)
filter(flights,month==1,day==1)

set.seed(123)
sample_n(flights,20)
0.001*nrow(flights)
sample_frac(flights,0.001)

arrange(flights,year,month,day)
arrange(flights,desc(arr_delay)) #descending order

names(flights)
select(flights,year,month,day)
select(flights,year:day)
select(flights,-year)
slect(flights,-(year:day))

select(flights, starts_with("sched"))
select(flights,ends_with("delay"))
select(flights,contains("arr"))
select(flights,matches("*_*_*")) #regular expression matching
select(flights,last_col())

dim(flights)
dim(distinct(flights))
distinct(select(flights,month,day))
distinct(flights,month,day) #same as line above

sat=pull(flights,sched_arr_time)
summary(sat)

rename(flights,dest=destination,tail_num=tailnum)