[R] add a variable a data frame to sequentially count unique rows

Rui Barradas ru|pb@rr@d@@ @end|ng |rom @@po@pt
Sat Jul 3 09:28:32 CEST 2021


Either I'm not understanding or isn't this just any of

aggregate(count ~ ., data = test, FUN = length)

test %>% count(group1, group2, name = "Count")


Hope this helps,

Rui Barradas

Às 23:27 de 02/07/21, Yuan Chun Ding escreveu:
> Hi R users,
> In this test file,
> test  <- data.frame(group1=c("g1", "g1", "g1", "g2", "g2", "g2", "g2", "g2", "g2"),
>                                         group2=c("k1", "a2", "a2", "c5", "n6", "n6", "n6", "m10","m10"),
>                                         count= c( 1,     1,    2,   1,     2,   2,     2,    3,    3 ));
> I have group 1 and group2 variable and want to add the count variable to sequentially count unique rows defined by group1 and group2.
> I hope to use the following functions in library (tidyverse),  No one worked well.
> test %>% group_by(group1, group2) %>% mutate(count = row_number())
> test %>% group_by(group1, group2) %>% mutate(count = 1:n())
> test %>% group_by(group1, group2) %>% mutate(count = seq_len(n()))
> test %>% group_by(group1, group2) %>% mutate(count = seq_along(group1, group2))
> Can you help me to make the third column in the test data frame?
> Thank you,
> Ding
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