R: selecting top n rows using slice(arrange)
I'm trying to select the top 6 rows (by value) from a data frame in R using
top6 <- d %>%
filter(ReportingYear==2016) %>%
arrange(desc(total.emission)) %>%
slice(1:6)
but it returns all the rows in d.
I couldn't understand this behaviour until I realised that there was something odd to me about the object d that is at the start of the pipeline.
> class(T4.d)
[1] "grouped_df" "tbl_df" "tbl" "data.frame"
The object d is created using
d <- facilities %>%
left_join(releases) %>% #get activity id
filter(PollutantName == "Methane (CH4)" & ActivityCode=="5.(d)") %>%
#filter for pollutant and activity
group_by(CountryName,ReportingYear) %>% #group
summarise(total.emission = sum(TotalQuantity)) #summarise
With
> class(facilities)
[1] "data.frame"
Given that facilities is a data frame, I was expecting the class of d to be data frame too. It seems to me that d is of a different class. Can somebody help?
Thanks
r class dataframe dplyr tidyverse
edited Nov 23 '18 at 19:42
Ista
7,69712426
asked Nov 19 '18 at 19:51
alessandroalessandro
244
add a comment |
I'm trying to select the top 6 rows (by value) from a data frame in R using
top6 <- d %>%
filter(ReportingYear==2016) %>%
arrange(desc(total.emission)) %>%
slice(1:6)
but it returns all the rows in d.
I couldn't understand this behaviour until I realised that there was something odd to me about the object d that is at the start of the pipeline.
> class(T4.d)
[1] "grouped_df" "tbl_df" "tbl" "data.frame"
The object d is created using
d <- facilities %>%
left_join(releases) %>% #get activity id
filter(PollutantName == "Methane (CH4)" & ActivityCode=="5.(d)") %>%
#filter for pollutant and activity
group_by(CountryName,ReportingYear) %>% #group
summarise(total.emission = sum(TotalQuantity)) #summarise
With
> class(facilities)
[1] "data.frame"
Given that facilities is a data frame, I was expecting the class of d to be data frame too. It seems to me that d is of a different class. Can somebody help?
Thanks
r class dataframe dplyr tidyverse
edited Nov 23 '18 at 19:42
Ista
7,69712426
asked Nov 19 '18 at 19:51
alessandroalessandro
244
2
Check the output afterfilter
– akrun
Nov 19 '18 at 19:53
1
Can you post a sample of your data?
– TeeKea
Nov 19 '18 at 19:58
1
This question is pretty clear, and I can offer a helpful answer. Please reopen it so I can do that.
– Ista
Nov 23 '18 at 19:42
add a comment |
I'm trying to select the top 6 rows (by value) from a data frame in R using
top6 <- d %>%
filter(ReportingYear==2016) %>%
arrange(desc(total.emission)) %>%
slice(1:6)
but it returns all the rows in d.
I couldn't understand this behaviour until I realised that there was something odd to me about the object d that is at the start of the pipeline.
> class(T4.d)
[1] "grouped_df" "tbl_df" "tbl" "data.frame"
The object d is created using
d <- facilities %>%
left_join(releases) %>% #get activity id
filter(PollutantName == "Methane (CH4)" & ActivityCode=="5.(d)") %>%
#filter for pollutant and activity
group_by(CountryName,ReportingYear) %>% #group
summarise(total.emission = sum(TotalQuantity)) #summarise
With
> class(facilities)
[1] "data.frame"
Given that facilities is a data frame, I was expecting the class of d to be data frame too. It seems to me that d is of a different class. Can somebody help?
Thanks
r class dataframe dplyr tidyverse
edited Nov 23 '18 at 19:42
Ista
7,69712426
asked Nov 19 '18 at 19:51
alessandroalessandro
244
I'm trying to select the top 6 rows (by value) from a data frame in R using
top6 <- d %>%
filter(ReportingYear==2016) %>%
arrange(desc(total.emission)) %>%
slice(1:6)
but it returns all the rows in d.
I couldn't understand this behaviour until I realised that there was something odd to me about the object d that is at the start of the pipeline.
> class(T4.d)
[1] "grouped_df" "tbl_df" "tbl" "data.frame"
The object d is created using
d <- facilities %>%
left_join(releases) %>% #get activity id
filter(PollutantName == "Methane (CH4)" & ActivityCode=="5.(d)") %>%
#filter for pollutant and activity
group_by(CountryName,ReportingYear) %>% #group
summarise(total.emission = sum(TotalQuantity)) #summarise
With
> class(facilities)
[1] "data.frame"
Given that facilities is a data frame, I was expecting the class of d to be data frame too. It seems to me that d is of a different class. Can somebody help?
Thanks
r class dataframe dplyr tidyverse
r class dataframe dplyr tidyverse
edited Nov 23 '18 at 19:42
Ista
7,69712426
asked Nov 19 '18 at 19:51
alessandroalessandro
244
edited Nov 23 '18 at 19:42
Ista
7,69712426
asked Nov 19 '18 at 19:51
alessandroalessandro
244
edited Nov 23 '18 at 19:42
Ista
7,69712426
edited Nov 23 '18 at 19:42
Ista
7,69712426
edited Nov 23 '18 at 19:42
Ista
7,69712426
7,69712426
asked Nov 19 '18 at 19:51
alessandroalessandro
244
asked Nov 19 '18 at 19:51
alessandroalessandro
244
asked Nov 19 '18 at 19:51
alessandroalessandro
244
244
2
Check the output afterfilter
– akrun
Nov 19 '18 at 19:53
1
Can you post a sample of your data?
– TeeKea
Nov 19 '18 at 19:58
1
This question is pretty clear, and I can offer a helpful answer. Please reopen it so I can do that.
– Ista
Nov 23 '18 at 19:42
add a comment |
2
Check the output afterfilter
– akrun
Nov 19 '18 at 19:53
1
Can you post a sample of your data?
– TeeKea
Nov 19 '18 at 19:58
1
This question is pretty clear, and I can offer a helpful answer. Please reopen it so I can do that.
– Ista
Nov 23 '18 at 19:42
2
2
Check the output after
filter– akrun
Nov 19 '18 at 19:53
Check the output after
filter– akrun
Nov 19 '18 at 19:53
1
1
Can you post a sample of your data?
– TeeKea
Nov 19 '18 at 19:58
Can you post a sample of your data?
– TeeKea
Nov 19 '18 at 19:58
1
1
This question is pretty clear, and I can offer a helpful answer. Please reopen it so I can do that.
– Ista
Nov 23 '18 at 19:42
This question is pretty clear, and I can offer a helpful answer. Please reopen it so I can do that.
– Ista
Nov 23 '18 at 19:42
add a comment |
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2
Check the output after
filter– akrun
Nov 19 '18 at 19:53
1
Can you post a sample of your data?
– TeeKea
Nov 19 '18 at 19:58
1
This question is pretty clear, and I can offer a helpful answer. Please reopen it so I can do that.
– Ista
Nov 23 '18 at 19:42