In skranz/RTutor: Interactive R problem sets with automatic testing of solutions and automatic hints

Problemset Fill In Example

Note: Always save your solution files with UTF-8 Encoding!

Adapt the working directory below and run the setup chunk in RStudio. This creates the problem set files and the sample solution from this solution file.

< ignore

library(RTutor)
setwd("D:/libraries/RTutor/RTutor/inst/examples")
ps.name = "fill_in"; sol.file = paste0(ps.name,"_sol.Rmd")
# character vector of all packages you load in the problem set
libs = c("ggplot2") 
create.ps(sol.file=sol.file, ps.name=ps.name,libs=libs, rps.has.sol=TRUE, addons="quiz")
# Show the problem set in the webbrowser
show.ps(ps.name, sample.solution=FALSE,auto.save.code = TRUE)
stop.without.error()

>

Exercise 1 -- Fill in the placeholders

a) We often want to compute some summary statistic of a vector. For example:

#< hint
cat("If you have a fill in block. Better add a custom chunk hint (at the beginning. That is because automatic hints don't work well if we have syntactically incorrect code that cannot be parsed, like head(___).")
#>

#< task
df = data.frame(a=1:10, b=10:1)
#>

# Let dat contain all rows in which a*b is bigger than 25
#< fill_in
# dat = filter(df, ___)
# # Show the head of dat
# head(___)
#>
dat = filter(df, a*b > 25)
# Show the head of dat
head(dat)

skranz/RTutor documentation built on Feb. 7, 2024, 12:53 a.m.