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Questions tagged [tidyselect]

Questions about `r` package `tidyselect` used in many functions from the `tidyverse` packages

88 questions
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dplyr::select() with some variables that may not exist in the data frame?

I have a helper function (say foo()) that will be run on various data frames that may or may not contain specified variables. Suppose I have library(dplyr) d1 <- data_frame(taxon=1,model=2,z=3) d2 <- data_frame(taxon=2,pss=4,z=3) The variables I…
Ben Bolker
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Sophisticated formula inside arrange

I would like to obtain a generic formula to arrange dataframes with a varying number of columns. For example, in this case the dataframe contains "categ_1, categ_2, points_1, points_2": library(tidyverse) set.seed(1) nrows <- 20 df <-…
crestor
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1 answer

tidyselect changes how to refer an external vector of variable names in selecting functions in R

I have started to recieve a warning when using selecting functions within tidyverse packages. Example: library(dplyr) set.seed(123) df = data.frame( "id" = c(rep("G1", 3), rep("G2", 4), rep("G3", 3)), "total" = sample.int(n = 10), "C1" =…
alvaropr
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replace_na with tidyselect?

Suppose I have a data frame with a bunch of columns where I want to do the same NA replacement: dd <- data.frame(x = c(NA, LETTERS[1:4]), a = rep(NA_real_, 5), b = c(1:4, NA)) For example, in the data frame above I'd like to do something like…
Ben Bolker
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1 answer

Mutate multiple variable to create multiple new variables

Let's say I have a tibble where I need to take multiple variables and mutate them into new multiple new variables. As an example, here is a simple tibble: tb <- tribble( ~x, ~y1, ~y2, ~y3, ~z, 1,2,4,6,2, 2,1,2,3,3, 3,6,4,2,1 ) I want to…
Jacob Nelson
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6
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2 answers

Can I group_by columns with starts_with?

I'm dealing with a big dataframe that has a number of columns I want to group by. I'd like to do something like this: output <- df %>% group_by(starts_with("GEN", ignore.case=TRUE),x,y) %>% summarize(total=n()) %>% arrange(desc(total)) is…
Andrew P
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1 answer

Specify the dots argument when calling a tidyselect-using function without needing to specify the preceding arguments

Here's a simplified version of a function I have in a package that uses the ... argument and tidyselect to select variables: # this toy function just selects the ... variables foo <- function(dat = mtcars, ...){ expr <- rlang::expr(c(...)) …
Sam Firke
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1 answer

Can you list an exception to tidyselect `everything()`

library(tidyverse) iris %>% as_tibble() %>% select(everything()) #> # A tibble: 150 x 5 #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> #> 1 5.1 3.5 …
Display name
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2 answers

dplyr::filter "No tidyselect variables were registered"

I am trying to filter specific rows of my tibble using the dplyr::filter() function. Here is part of my tibble head(raw.tb): A tibble: 738 x 4 geno ind X Y 1 san1w16 A1 467 383 2 san1w16 A1 …
Al3xEP
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R: Tidyverse selection semantics tidyselect::eval_select appending numbers to duplicates

I am trying for some time to understand tidyverse design and how to program with it. I was trying to write a function that uses tidyselect semantics, and I found that tidyselect::eval_select appends numbers to lhs expressions. This was not…
Claudiu Papasteri
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4
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1 answer

Specify a column type across multiple columns with tidy-selection in readr package

I attempt to use read_csv from {readr} to read a CSV file into R. To demonstrate my real issue, I reset the argument guess_max to 5 at first (default is 1000) library(readr) formals(read_csv)$guess_max <- 5 and take a smaller literal data for…
user18894435
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5 answers

dplyr rowwise summarise by column, grouped by name

Let's consider this simple dataset set.seed(12345) df <- data.frame(a1 = rnorm(5), a2 = rnorm(5), a3 = rnorm(5), b1 = rnorm(5), b2 = rnorm(5), b3 = rnorm(5), c1 = rnorm(5), c2 = rnorm(5), c3 = rnorm(5)) Which…
nico
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Using eval_select inside of a nested function

I'm trying to use tidyselect::eval_select() inside a nested function, but am struggling to work out how to pass through user arguments. Inside 1 level of nesting, this works fine: library(tidyselect) library(rlang) my_function <- function(.x, ...)…
thisisnic
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Issue with selecting negative values in dplyr with embrace {{ arg }}

I have an issue with selecting negative columns based on a variable. I found a similar issue reported here: https://github.com/tidyverse/dplyr/issues/4813 but the provided solution does not work (see repex below). If anyone knows a workaround, that…
Baraliuh
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2 answers

Programming with dplyr: Renaming a column with variable using glue syntax

I've read through Programming with dplyr and understand that rename() and select() use tidy selection. I'm trying to combine this with the glue syntax to create a custom function using the new double curly syntax (rlang v0.4.0), however I'm getting…
Alwin
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