learnr | Feel | Data Visualization library

Motivation: I want to write an interface that uses questions from the R package exams in learnr questions/quizzes. In R/exams each question is either an R/Markdown (Rmd) or R/LaTeX (Rnw) file with a certain structure specifying question, solution, and further meta-information. The questions can contain R code to make them dynamic, e.g., sampling numbers or certain text building blocks etc. Hence, the workflow is that first the questions are run through knitr::knit or utils::Sweave and then embedded in a suitable output format.

Problem: When I rmarkdown::run("learnr+rexams.Rmd") a learnr tutorial that dynamically produces a question or quiz from an Rmd exercise I get the error:

Error in if (grepl(not_valid_char_regex, label)) { : argument is of length zero

The code for a simple reproducible example learnr+rexams.Rmd is included below. The reason for the error appears to be that learnr runs a function verify_tutorial_chunk_label() that tries to assure the the learnr R chunk labels are well formatted. However, confusion is caused by the chunks that are run by the R/exams package, unnecessarily leading to the error above.

Workarounds: I can disable the verify_tutorial_chunk_label() in the learnr namespace and then everything works well. Or I can use Rnw instead of Rmd exercises and then learnr does not conflict with Sweave(). Also, when I run my code outside of a learnr tutorial it works fine.

Question: Can I do anything less invasive to make exams cooperate with learnr? For example, setting some appropriate knitr options or something like that?

Example: This is the source for the minimal learnr tutorial learnr+rexams.Rmd that replicates the problem. Note that everything is very much simplified and only works for certain R/exams exercises, here using the function exercise template that ships with R/exams.

I’m new to creating learnr tutorials and even more to creating packages, but after reading tutorials on these two topics, I can now create simple packages and simple learnr tutorials. Now that I know a bit about both topics, I would like to deploy my interactive tutorials in a basic package, but there are not many resources available. Can you show me how to do this in the simplest possible way?

I am creating a homework problem with learnr:tutorial. I want to give the students 3 attempts to solve the problem before moving to the next section. I have progressive: true and allow_skip: false But at the moment, there is unlimited try again and even with the incorrect answer, the user can continue to the next question. An example of a question is:

I want to allow students to input their student ID at the beginning of every quiz they take. There are no correct answers as long as they input a 7 digit number. This is what I have right now but the function does not run when the defined answers are sot one single text. How can I accept all possible entries to a question?

I'm writing a learnr::tutorial markdown for my students, and would like one of the slides to show the latest image from the webcam on Palmer Station, Antarctica:

https://www.usap.gov/videoclipsandmaps/palwebcam.cfm

However, the field doesn't register as an image - likely because it is some sort of gallery?

I cannot use the page link, the image adress, or the image to insert into:

I would like to generate a pie radar / spider chart in python with 14 separate categories or "pizza slices". Something similar to this example created in excel or this example created with ggplot2.

This plt example was useful (code below), however the observations for different categories are connected with lines rather than having their own separate sections ("pizza slices"). Any ideas how to do this is python?

I am new to R so thank you in advance for your patience.

I would like to create a multiple choice quiz in R using the learnr package (the quiz content is not about r code). I have all of the questions, response options, and correct answers in a spreadsheet. Since my item bank has over 100 items, I will give a simpler example

I am using the learnr package and I would like to know if there is an easy way to change the caption of the submit button? Instead of "Submit Answer", I would like to change it to "Validate", for example. I could not find information in the package help.

I have created a tutorial in learnr and I have noticed that for each code chunk that I create, I need to rerun the code from previous chunks if I wish to use the same data.

For instance, if I have something like this :