Questions tagged [quasiquotes]
70 questions
0
votes
1 answer
Assign into variable from string
I would like to dynamically create a variable name from a string and then assign in a value. I believe I should be able to easily do this with {rlang} but haven't been able to work it out from package docs, Advanced R, and searching. Below is a…
maia-sh
- 537
- 4
- 14
0
votes
0 answers
Rendering multiple Rmarkdown reports with parameters fails with "Error: `:=` can only be used within a quasiquoted argument" when data.table is used
Good morning everybody,
as stated above, I’m trying to render multiple Rmarkdown reports with different parameters for each report. Basically I have a folder of .csv files, which I have to clean up. I have packed all the steps in an .Rmd file,…
tim
- 427
- 1
- 6
- 10
0
votes
2 answers
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
- 4,141
- 5
- 26
- 55
0
votes
1 answer
F# code quotations: can I define my own concrete and abstract syntax?
In Haskell I can use the quasiquoter to produce a custom AST using concrete syntax defined by custom parser, as described here: https://wiki.haskell.org/Quasiquotation
Is this possible in F#?
runeks
- 1,745
- 2
- 17
- 26
0
votes
2 answers
using quasiquotation in functions with formula interface
I want to write a custom function that can take bare and "string" inputs, and can handle both functions with and without the formula interface.
custom function example
# setup
set.seed(123)
library(tidyverse)
# custom function
foo <-…
Indrajeet Patil
- 4,673
- 2
- 20
- 51
0
votes
2 answers
using column names in functions that rely on quasiquotation
I am writing a custom function that is expected to work with both unquoted and "quoted" inputs. I can implement it using rlang. But it doesn't seem to work when "quoted" arguments are provided using colnames.
Any ideas on how this can be resolved?…
Indrajeet Patil
- 4,673
- 2
- 20
- 51
0
votes
1 answer
Quasiquoter concrete syntax for visible type application
In the following snippet, the first argument to foo, SNat @n, is assembled manually:
[e|foo $(appTypeE (conE 'SNat) n')|]
where
n' = litT . numTyLit . fromIntegral $ n
Is there concrete TH quasiquoter syntax for this? I.e. I'd like to write…
Cactus
- 27,075
- 9
- 69
- 149
0
votes
1 answer
Trouble with quotes and quasi-quotation and regular expressions inside a function in R
I am trying to write a function which uses gsub to find and replace certain strings. I have 10+ excel spreadsheets with a list of monetary values using standard Swedish separators for thousands and decimals, i.e. a decimal is noted by a comma and…
Kuns
- 25
- 3
0
votes
1 answer
Lifting string with Scalameta
I would like injecting a method 'toCSV' to parse a class into CSV String. My function take two paramters :
Seq[String] : header
Seq[Seq[Any]] : fields
My macro :
class model extends scala.annotation.StaticAnnotation {
inline def apply(defn:…
user2931656
- 253
- 2
- 3
- 13
0
votes
1 answer
rlang: The assignment form of quo, documentation, finding of. Or something
A lot of the help page examples for quo take forms like this one, assigning an output of quo to quo:
quo <- quo(letters)
quo <- quo(toupper(!! quo))
quo
eval_tidy(quo)
It seems clear that these assignments do not overwrite the quo function (since…
andrewH
- 2,281
- 2
- 22
- 32