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

edited Nov 23 '18 at 19:42

Ista

7,65712426

asked Nov 19 '18 at 19:51

alessandro

244

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

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

edited Nov 23 '18 at 19:42

Ista

7,65712426

asked Nov 19 '18 at 19:51

alessandro

244

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

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

edited Nov 23 '18 at 19:42

Ista

7,65712426

asked Nov 19 '18 at 19:51

alessandro

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

edited Nov 23 '18 at 19:42

Ista

7,65712426

asked Nov 19 '18 at 19:51

alessandro

244

edited Nov 23 '18 at 19:42

Ista

7,65712426

asked Nov 19 '18 at 19:51

alessandro

244

edited Nov 23 '18 at 19:42

Ista

7,65712426

edited Nov 23 '18 at 19:42

Ista

7,65712426

edited Nov 23 '18 at 19:42

Ista

7,65712426

asked Nov 19 '18 at 19:51

alessandro

244

asked Nov 19 '18 at 19:51

alessandro

244

asked Nov 19 '18 at 19:51

alessandro

244

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

add a comment |

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

Check the output after filter
– akrun
Nov 19 '18 at 19:53

Can you post a sample of your data?
– TeeKea
Nov 19 '18 at 19:58

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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