Questions tagged [dplyr]
Use this tag for questions relating to functions from the dplyr package, such as group_by, summarize, filter, and select.
dplyr
37,217
questions
2
votes
1
answer
30
views
Coalescing two `POINT` columns gives a list-column instead of another `POINT` column
I have two tibbles, each with a geometry column. I want to merge those and make a sort of coalesce() but if I combine ifelse() with st_is_empty() I end up with a list column instead of a POINT column:
...
- 8,333
2
votes
3
answers
47
views
Custom function with dplyr::summarise with conditions
I want to create a function named ratio_function that does the same as the following code:
data = data %>%
group_by(ID) %>%
summarise(sum_ratio = sum(surface[category == "A"], na....
- 33
0
votes
2
answers
33
views
How can I merge specific dates into a date range in R
I am trying to integrate information on newspaper closures into a dataset of municipal elections in various provinces. The municipal elections data frame looks very much like this.
Each province holds ...
- 1,837
0
votes
3
answers
26
views
Using 'slice_max()' in for loop
I'm trying to create new dataframes with the top three values for each column across a dataframe.
probUnweighted <- data.frame(
Sample1 = c(0.9, 0.2, 0.03, 0.1, 0.5, 0.09),
Sample2 = c(0.045, 0.11,...
3
votes
5
answers
71
views
Order columns based on suffix with dplyr and stringr
I have a dataframe that has columns that are separated out by suffix see ex_df. Each time I run the code there may be varying column amounts based on database entries so I am trying to find a way to ...
- 31
2
votes
4
answers
93
views
Conditional mutate based on order of variables
I have vectors that index the events A, B, C. Each event occurs at least once but can occur multiple times. For example:
Sequence 1: c("A", "B", "C")
Sequence 2: c("...
- 630
0
votes
2
answers
31
views
Create labelled column from numeric and character columns
Having two columns, one with numeric values and other with text labels that correspond exactly with the numeric values, how can I create a labelled column (<dbl+lbl>), like the ones imported by ...
0
votes
1
answer
25
views
Re_order based on month and date while ignoring year in R
Lubridate doesn't have a month-date col type it appears and I would like to make a histogram across several years that focuses just on the month and day while ignoring the year. But when it comes time ...
- 689
1
vote
2
answers
45
views
data frame breakdown by year, rounding up by duration of each period
I have a data frame of county executives and the first and last years they served.
I am running a panel study with county-year as the unit of analysis. The date range is 2000 to 2009.
I will like to ...
- 381
0
votes
4
answers
65
views
Substring replacement in data frame, based on a look-up table [closed]
As input, I've got a large data frame in R with lists of strings of different lengths, referring to certain codes - like this:
glt.code glt.phylogeny
1 adha1238 adha1238 ...
- 183
2
votes
3
answers
74
views
R how to create a new dataframe with column values calculated from three other dataframes
I'm new to R and struggling to create a new dataframe where the values for multiple columns are created using values from columns with the same names from three other dataframes with the same ...
- 21
2
votes
4
answers
108
views
data.table vs dplyr: apply function returning changing column names over groups
I want to apply a function (ratefunc()) to a grouped data frame which returns changing column names dependent on the result:
library(data.table)
library(dplyr)
dt <- data.table:::data.table(
...
- 119
2
votes
3
answers
69
views
Complete and fill missing rows with groups of uneven length
I have a dataframe of county executives and the year they were inaugurated. I am running a panel study with county-year as the unit of analysis. The date range is 2000 to 2004.
I will like to expand ...
- 381
0
votes
1
answer
33
views
Remove string from column across group of rows in another column
I would like to remove a string from one column across a group of rows in another column. In the below reprex, I would like to remove the string in snippet from the string in text in any row in the ...
- 557
1
vote
2
answers
23
views
How to select specific columns across multiple dataframes in R and then bind them into one data.frame?
I am trying to select or subset multiple data frames with different number of columns. They all contain the same columns of interest, so I am trying to make them all contain the same columns so I can ...
- 299