I need to get a vector of unique values from filtered dataframe data using dplyr library.
Dummy example:
df<-data.frame(site = letters[seq( from = 1, to = 5)],
year = c(1,2,2,3,4))
site year
1 a 1
2 b 2
3 c 2
4 d 3
5 e 4
I want to print out a vector of sites where year == 2.
The dplyr package returns a dataframe. How to turn it to a vector?
df %>%
filter(year == 2) %>%
select(site) #
# unique ??? how to convert the filtered dataframe to vector?
I know how to make this in two steps using classical approach: filter the dataframe and than access the column:
# Filter data and get a new dataframe:
df2<-df %>%
dplyr::filter(year == 2) %>%
select(site)
# Check the column values after filtering:
df2$site
But I am sure there is a nicer way in dplyr?
Expected output:
[1] b c
