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

[Bert Gunter]

Still can't makes sense of it. Shouldn't rows 5-7 have 3 for counts
and rows 8-9 have 2? If not, then I give up trying to figure out what
you mean. Maybe someone wlse can.


Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Fri, Jul 2, 2021 at 4:44 PM Yuan Chun Ding <ycding using coh.org> wrote:
>
> Hi Bert,
>
> I am very sorry that I made a mistake for the second count value. The original data are much more complicated, I just made a toy table.
>
>
>  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,       2,        2,       1,      2,   2,     2,    3,    3 ));
>
> I want to get count column.
>
> the summary count is below.
> count_test <- test %>% group_by(group1 ) %>%summarise(Number_of_region = n_distinct(group2))
>
> Thank you,
>
> Ding
>
> -----Original Message-----
> From: Bert Gunter [mailto:bgunter.4567 using gmail.com]
> Sent: Friday, July 2, 2021 4:36 PM
> To: Yuan Chun Ding <ycding using coh.org>
> Cc: r-help using r-project.org
> Subject: Re: [R] add a variable a data frame to sequentially count unique rows
>
> Your example makes no sense (to me, anyway). Please check it carefully. Note that the count in rows 2 and 3 increment but the counts in rows 5-7 or rows 8-9 do not. So your specification seems inconsistent to me.
>
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along and sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
> On Fri, Jul 2, 2021 at 3:27 PM Yuan Chun Ding <ycding using coh.org> wrote:
> >
> > 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,       2,        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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