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Questions tagged [tidyeval]

Please use this tag for questions about using tidy evaluation within the tidyverse framework. For more information please refer to this handbook: https://tidyeval.tidyverse.org/

473 questions
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Tidy evaluation inside package and devtools::check() notes

Let's create a package, use dplyr and the magrittr pipe, and craft a new function: usethits::create_package("TidyEvalInsidePackage") usethis::use_package_doc() usethis::use_package("dplyr") usethis::use_pipe(export =…
pietrodito
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Pull a column given as argument in function

I have a function that takes in a dataset and a variable as argument. It needs to filter based on some criteria, pull the column with name as variable and calculate its mean then. I am not able to pass the variable as column name though. Kindly…
FinRC
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Check if object is Null or undefined

I have a function that includes an optional variable parameter. By default, I set the variable to NULL, but if it isn't NULL I'd like my function to do some stuff. I need a way to check if the variable is not null. This is complicated because I am…
Lief Esbenshade
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Using character object to indicate column name within R's glue function?

I am trying to create a "label" column in my dataset using the glue::glue function. I want each row of this label column to include the value of a user-selected column. For example, using the mtcars dataset, I'd like to create a label column that…
Jake Scott
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using `tidyeval` with the exposition pipe operator

I can't seem to figure out how to use the %$% operator from magrittr with tidyeval. Here is a minimally reproducible example of this problem: table works with exposition operator outside tidyeval library(magrittr) print(mtcars %$% table(am)) #>…
Indrajeet Patil
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tidyverse use across with pasted external vector that contains column names to mutate

Let's assume the following data: df <- data.frame(x = c(1, 2), y = c(3, 4), z = c(5, 6)) Let's further assume I have a vector that contains column names I want to work on, e.g. var_names_1 <- c("test", "x",…
deschen
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Renaming column in tidyeval in dplyr 1.0

I wish to generate new columns based on receiving variables in tidy evaluation. For example, library(dplyr) some_custom_measure <- function(.data, cola, colb) { .data %>% mutate("{{ cola }}_x_{{ colb }}" := {{ cola }} * {{ colb }}) } iris %>% …
ThomasJc
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Create formulas from R dataframe of coefficients and variables

I am trying to create a function, formulator, to create R formulas out of a dataframe of responses, coefficients and constants and function names. My intent is to use it when converting large sheets of historical functions into useable R code. It is…
Silviculturalist
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Using a data frame column name with glue_data

Hi I have a function in R: myfunction<-function(.data, pvalue, roundto=2){ glue::glue_data(.x=.data, "p={format(round(pvalue,digits=roundto),nsmall=roundto}") } This works fine when I pass .data$pvalue as pvalue to myfunction() Ideally I would…
ab192
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Using a tidyeval column after join

I have a function that joins data together, and then should take the average of a column. Here I can join the data, but I am not sure how to average the x.x and x.y columns in a sufficiently generalized way library(dplyr) a <- tibble(id = 1:3, x…
John-Henry
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Use quasiquotation for formula syntax in a user-created function?

When I run this code: # Create example data df <- tibble(age=rnorm(10), income=rnorm(10)) make_model <- function(response_var, df){ # Create formula form <- as.formula(response_var ~ .) # Create model model <- lm(form ,…
max
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Curly curly passing a column name to mutate or regex_left_join returns error, could not find assignment operator `:=`

I am getting an error in console: Error :=({ : could not find function ":=" I am using a fuzzyjoin (by David Robinson) and tidyverse packages only. The function is accepted with no syntax errors. On execution the error is thrown at me. What could…
Jacek Kotowski
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as.formula function call where formula inputs are shiny reactive objects

This has been bugging me for ages. I have a function where the first argument either needs to be of the form function(data~ group_variable) OR of the form function(data, group = data$group_variable). I have this function running smoothly in the…
Andrew McCartney
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Using tidy evaluation to filter in my own function

I am having a hard time to use tidy evaluation when writing my own function. I'll illustrate my problem using the ToothGrowth dataset, where we want to filter for e.g. VC as the…
portablemaex
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How to print variable name from function argument using {{}} in R?

I am new to R and trying to understand functional Programming and use of {{}}. I am not able to figure out how to just print the name of variable_name from argument without !!, enquos I have tried below code but that doesn't work as…
ViSa
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