dplyr | dplyr : A grammar of data manipulation | Data Visualization library
kandi X-RAY | dplyr Summary
kandi X-RAY | dplyr Summary
dplyr is a grammar of data manipulation, providing a consistent set of verbs that help you solve the most common data manipulation challenges:. These all combine naturally with group_by() which allows you to perform any operation “by group”. You can learn more about them in vignette("dplyr"). As well as these single-table verbs, dplyr also provides a variety of two-table verbs, which you can learn about in vignette("two-table"). If you are new to dplyr, the best place to start is the data transformation chapter in R for data science.
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Trending Discussions on dplyr
QUESTION
In my dataframe, I have multiple columns with student grades. I would like to sum the "Quiz" columns (e.g., Quiz1, Quiz2). However, I only want to sum the top 2 values, and ignore the others. I want to create a new column with the total (i.e., the sum of the top 2 values). There is also the issue of having grades that tie for the top 2 grades in a given row. For example, Aaron has a high score of 42, but then there are two scores that tie for the second highest (i.e., 36).
Data
...ANSWER
Answered 2021-Dec-12 at 23:25QUESTION
With the parent-child
relationships data frame as below:
ANSWER
Answered 2022-Feb-25 at 08:17We can use ego
like below
QUESTION
I wonder how can we filter rows with the same values in columns using dplyr
package? I tried doing something in opposite to what was asked and proposed in this question but nothing worked.
I used the approach with apply
function but received the following error:
ANSWER
Answered 2022-Jan-14 at 09:42Not quite native tidyverse, but does what you desire?
QUESTION
I've created a dynamic column name w/ dplyr::mutate() based on this thread Use dynamic variable names in `dplyr` and now I want to sort the new column.... but I'm not correctly passing the column name
...ANSWER
Answered 2022-Feb-07 at 07:47Unfortunately I don't know if any way to use that nice glue syntax with anything that's not on the left side of a :=
. That's there the magic happens. You can get something to work if you take care of the explicity conversion to sumbol your self and do the string building manually. It's not pretty, but this works
QUESTION
I've built this new ggplot2
geom layer I'm calling geom_triangles
(see https://github.com/ctesta01/ggtriangles/) that plots isosceles triangles given aesthetics including x, y, z
where z
is the height of the triangle and
the base of the isosceles triangle has midpoint (x,y) on the graph.
What I want is for the geom_triangles()
layer to automatically provide legend components for the height and width of the triangles, but I am not sure how to do that.
I understand based on this reference that I may need to adjust the draw_key
argument in the ggproto
StatTriangles
object, but I'm not sure how I would do that and can't seem to find examples online of how to do it. I've been looking at the source code in ggplot2
for the draw_key
functions, but I'm not sure how I would introduce multiple legend components (one for each of height and width) in a single draw_key
argument in the StatTriangles
ggproto
.
ANSWER
Answered 2022-Jan-30 at 18:08I think you might be slightly overcomplicating things. Ideally, you'd just want a single key drawing method for the whole layer. However, because you're using a Stat
to do the majority of calculations, this becomes hairy to implement. In my answer, I'm avoiding this.
Let's say I'd want to use a geom-only implementation of such a layer. I can make the following (simplified) class/constructor pair. Below, I haven't bothered width_scale
or height_scale
parameters, just for simplicity.
QUESTION
The dataframe looks like this
...ANSWER
Answered 2022-Jan-16 at 18:49With apply
, use MARGIN = 1
, to loop over the rows on the numeric columns, sort
, get the head/tail
depending on decreasing = TRUE/FALSE
and return with the mean
in base R
QUESTION
I was wondering if anyone knows a way to combine a table and ggplot legend so that the legend appears as a column in the table as shown in the image. Sorry if this has been asked before but I haven't been able to find a way to do this.
Edit: attached is code to produce the output below (minus the legend/table combination, which I am trying to produce, as I stitched that together in Powerpoint)
...ANSWER
Answered 2021-Dec-31 at 13:24This is an interesting problem. The short answer: Yes, it's possible. But I don't see a way around hard coding the position of table and legend, which is ugly.
The suggestion below requires hard coding in three places. I am using {ggpubr} for the table, and {cowplot} for the stitching.
Another problem arises from the legend key spacing for vertical legends. This is still a rather unresolved issue for other keys than polygons, to my knowledge. The associated GitHub issue is closed The legend spacing is not a problem any more. Ask teunbrand, and he knows the answer.
Some other relevant comments in the code.
QUESTION
Is it possible to relocate
rows in tidyverse
framework like it is possible for columns with dplyr
relocate
?
In this example I would like to relocate row 1 to position 5 (end of dataframe)
My dataframe:
...ANSWER
Answered 2021-Aug-12 at 15:46Maybe this is not so elegant but here is a way:
QUESTION
I am looking for an easy, concise way to use dplyr::select
without rearranging columns.
Consider this dataset:
...ANSWER
Answered 2021-Dec-22 at 21:28We could use match
with sort
QUESTION
I want to use dplyr::coalesce
to find the first non-missing value between pairs of variables in a dataframe containing multiple pairs of variable. The goal is to create a new dataframe with now only one copy for each pair of variable (a coalesce variable without NA values).
Here is an example:
...ANSWER
Answered 2021-Dec-22 at 04:40You could use transmute, e.g.
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