r - extracting unique rows of data using dplyr -

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this question has answer here:

i'm trying extract rows when b unique value per a.

here sample data

a <- c(1,1,2,2,3,3,4,4,5,5,5,6,6,7,7,8,8,9,9,9,9,9,10,10,10) b <- c(1,2,1,1,5,5,6,1,1,1,3,2,2,1,1,2,3,1,2,3,4,4,1,2,2) df1 <- data.frame(a, b)

and using dplyr package

library(dplyr)  unique <- df1 %>%   group_by(a) %>%   filter(n_distinct(b))

the desired output should data frame length 18

we can try

library(dplyr) df1 %>%     distinct()

or in base r

unique(df1)

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