magrittr Questions
5
Solved
I have a data frame which I am dcasting using the reshape2 package, and I would like to remove the first column and have it become the row names of the data frame instead.
Original dataframe, befo...
3
Solved
i have a rather specific question: how can I make a string into a factor and set its contrasts within a pipe ?
Let's say that I have a tibble like the following
tib <- data_frame (a = rep(c("...
7
Solved
When using the pipe operator %>% with packages such as dplyr, ggvis, dycharts, etc, how do I do a step conditionally? For example;
step_1 %>%
step_2 %>%
if(condition)
step_3
These appr...
7
Solved
1
Solved
Is there a way of doing the following
ex1 <- quote(iris)
ex2 <- quote(dplyr::filter(Species == "setosa" & Sepal.Width > 4))
substitute(x %>% y, list(x = ex1, y = ex2))
#&...
2
I am trying to learn the piping function (%>%).
When trying to convert from this line of code to another line it does not work.
---- R code -- original version -----
set.seed(1014)
replicate(6,sa...
1
Solved
In my R script, I would like to print a message in the middle of a long pipe (which takes a long time to run) without breaking the pipe. I need this to track the progress of the running pipeline.
I...
3
Solved
Is the %>% pipe operator always feeding the left-hand side (LHS) to the first argument of the right-hand side (RHS)? Even if the first argument is specified again in the RHS call?
Say I want t...
1
Solved
I have used %>%, the magrittr pipe, as given in its documentation by providing a function without empty parentheses to the RHS in this answer and got a comment that the recommended convention is...
1
Solved
Magrittr has those different pipes:
%>% Pipe
%<>% Assignment pipe
%$% Exposition pipe
%!>% Eager pipe
%T>% Tee pipe
What are their differences and use cases?
2
I have a main function which performs a handful of variously complicated (and long-running) computations on some data, it performs these steps using the pipe from tidyverse / magrittr. I would like...
Megaton asked 4/5, 2023 at 14:32
4
Solved
Can someone explain why table()doesn't work inside a chain of dplyr-magrittr piped operations? Here's a simple reprex:
tibble(
type = c("Fast", "Slow", "Fast", "Fast", "Slow"),
colour = c("Blue...
4
Solved
I would like to understand why, in the the dplyr or magrittr package, and more specifically the chaining function %>% has some trouble with the basic operators +, -, *, and /
Chaining takes the...
4
Solved
How can I use the pipe operator to pipe into replacement function like colnames()<- ?
Here's what I'm trying to do:
library(dplyr)
averages_df <-
group_by(mtcars, cyl) %>%
summarise(m...
3
Solved
I often use R's setNames function in a magrittr pipeline or elsewhere to fix the names of an object on the fly:
library(magrittr)
mytable %>% setNames(c("col1", "col2", "col3")) %>% ...[more...
5
Solved
I've been experimenting quite a bit with the increasingly popular %>% operator from the magrittr package.
I've used it enough that I've set a keyboard shortcut to save me typing:
shift+command...
3
Solved
Under certain circumstances, piping to return() doesn't appear to behave expectedly. To demonstrate, here are 4 cases
Suppose we define a function that returns the result of str_replace_all
library...
2
Solved
I would like to be able to print the name of a dataframe passed through the pipe. Is this possible? I can do.
printname <- function(df){
print(paste(substitute(df)))
}
printname(mtcars)
#[1] "...
2
Solved
How do you pipe an object into a specific place in an apply call, that isn't the first input? The magrittr dot placeholder does not seem to work for this.
dat <- 1:10
locs <- list(c(1, 2),...
5
In R 4.1 (May 2021) a native pipe operator was introduced that is "more streamlined" than previous implementations. I already noticed one difference between the native |> and the magri...
4
Solved
I'm running an example in R, going through the steps and everything is working so far except for this code produces an error:
words <- dtm %>%
as.matrix %>%
colnames %>%
(function...
2
Solved
Recently I have found the %$% pipe operator, but I am missing the point regarding its difference with %>% and if it could completely replace it.
Motivation to use %$%
The operator %$% could re...
1
Solved
I'm trying to achieve two things that might not be compatible: I would like my code that is in my RMarkdown chunks to be wrapped around in each each line when I create a PDF (in other words, the li...
Ostwald asked 3/8, 2020 at 0:17
3
Solved
Is there a way to pipe in base R, without having to define your own function (i.e. something 'out of the box'), and without having to load any external packages?
That is, some (base R) alternative ...
7
Solved
Is it possible to filter a data.frame for complete cases using dplyr? complete.cases with a list of all variables works, of course. But that is a) verbose when there are a lot of variables and b) i...
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