Restart early, restart often… and don’t restore data.

There are lots of debugging options in R

Doing something a fixed number of times:

sequence <- seq(from = 0, to = 2, by = 0.5)

for (number in sequence) {
  print(number)
}

[1] 0
[1] 0.5
[1] 1
[1] 1.5
[1] 2

Doing something until it is finished:

number <- 0
max.number <- 2
increment <- 0.5
while (number <= max.number) {
  print(number)
  number <- number + increment
}

[1] 0
[1] 0.5
[1] 1
[1] 1.5
[1] 2

Slide images: Jenny Bryan, https://github.com/jennybc/debugging

Death certificate (modified): Public Domain, https://commons.wikimedia.org/w/index.php?curid=214170

Autopsy painting by Rembrandt: https://www.mauritshuis.nl/en/explore/the-collection/artworks/the-anatomy-lesson-of-dr-nicolaes-tulp-146/detailgegevens/ Public Domain, https://commons.wikimedia.org/w/index.php?curid=64281722

The Night King: https://cnet4.cbsistatic.com/img/vugy5MvUVBvwcJf0JvKIBd1RwJE=/1200x675/2019/04/22/2b2fee8d-111a-4d19-ae83-4e61899cfd47/1nightking.jpg (probably copyright HBO)