library(learnr) knitr::opts_chunk$set(echo = FALSE)
Here's a simple exercise with an empty code chunk provided for entering the answer.
Write the R code required to add two plus two:
Nothing here, but the continue button should follow learnr's default (and be translated).
Here's an exercise with some prepopulated code as well as exercise.lines = 5
to provide a bit more initial room to work.
Now write a function that adds any two numbers and then call it:
add <- function() { }
Here's an exercise where the chunk is pre-evaluated via the exercise.eval
option (so the user can see the default output we'd like them to customize). We also add a "hint" to the correct solution via the chunk immediate below labeled print-limit-hint
.
Modify the following code to limit the number of rows printed to 5:
mtcars
head(mtcars)
You can include any number of single or multiple choice questions as a quiz. Use the question
function to define a question and the quiz
function for grouping multiple questions together.
Some questions to verify that you understand the purposes of various base and recommended R packages:
quiz( question("Which package contains functions for installing other R packages?", answer("base"), answer("tools"), answer("utils", correct = TRUE), answer("codetools") ), question("Which of the R packages listed below are used to create plots?", answer("lattice", correct = TRUE), answer("tools"), answer("stats"), answer("grid", correct = TRUE) ) )
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