I forgot to cc to rhelp.
Petr
Hi
Dunno how to do it by dplyr
I would use ave
df$MinValue <- ave(df$Value, paste(df$Class, df$Department), FUN =
function(x)
min(x[x>0]))
Cheers
Petr
> > -----Original Message-----
> > From: R-help <r-help-boun...@r-project.org> On Behalf Of Elahe chalabi
> via
> > R-help
> > Sent: Tuesday, May 11, 2021 1:12 PM
> > To: R-help Mailing List <r-help@r-project.org>
> > Subject: [R] Group by and duplicate a value/dplyr
> >
> > Hi all,
> >
> > I have the following data frame
> >
> >
> > dput(df)
> > structure(list(Department = c("A", "A", "A", "A", "A", "A", "A", "A",
> > "B", "B",
> > "B", "B", "B", "B", "B", "B"), Class = c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L,
> > 1L,
> > 1L, 1L, 1L,
> > 2L, 2L, 2L, 2L), Value = c(0L, 100L, 800L, 800L, 0L, 300L, 1200L, 1200L,
> > 0L,
> > 0L,
> > 400L, 400L, 200L, 800L, 1200L, 1200L)), class = "data.frame", row.names =
> > c(NA,
> > -16L))
> >
> >
> > I would like to group by "Department" and "Class" and repeat the minimum
> > value of "Valule" excluding zeros or get the second minimum value. The
> > desired output is:
> >
> >
> > dput(df)
> > structure(list(Department = c("A", "A", "A", "A", "A", "A", "A", "A",
> > "B", "B",
> > "B", "B", "B", "B", "B", "B"), Class = c(1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L,
> > 1L,
> > 1L, 1L, 1L,
> > 2L, 2L, 2L, 2L), Value = c(0L, 100L, 800L, 800L, 0L, 300L, 1200L, 1200L,
> > 0L,
> > 0L,
> > 400L, 400L, 200L, 800L, 1200L, 1200L), MinValue = c(100L, 100L, 100L,
> > 100L,
> > 300L, 300L, 300L, 300L, 400L, 400L, 400L, 400L, 200L, 200L, 200L, 200L)),
> > class =
> > "data.frame", row.names = c(NA, -16L))
> >
> >
> > how should I change the following dplyr to give me the desired output?
> >
> >
> > df <-
> > df %>%
> > group_by(Department,Class) %>%
> > mutate(MinValue=min(Value) )
> >
> >
> > Thanks for any help.
> > Elahe
> >
> > ______________________________________________
> > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> > PLEASE do read the posting guide http://www.R-project.org/posting-
> > guide.html
> > and provide commented, minimal, self-contained, reproducible code.
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