Milestone 4

2025-06-16

Announcements

  • Commit and pushes changes to AE

  • TEAMMATES peer evaluation will open today at noon and close Wednesday at 11:59pm

    • Let Marie/Mary know if you are not getting emails from TEAMMATES (check spam folder)

  • Today

    • Tips to help make project beautiful

    • Work on project

    • Review one other team’s project

Code cell options

  • We will examine the echo, warning, eval, fig-width, and fig-asp code chunk options using the following code:
ggplot(penguins, aes(x = bill_length_mm, y = bill_depth_mm)) + 
  geom_point()

  • To set code chunk options:

    • #| option: value – The spaces must be included! Without first space it’s just a comment.

    • Must be at the top of the code chunk or within the YAML at the top of the document (to include the same option for all code chunks)

  • Try the various options, render the document, and see what happens

Code cell options – echo

ggplot(penguins, aes(x = bill_length_mm, y = bill_depth_mm)) + 
  geom_point()

  • echo: Includes the code chunk in the ouptut.

  • We want this for labs to show our work. We do NOT want this for the project

  • To include this for the main project file (index.qmd), within yaml at top of document, change echo: true to echo: false. Then echo is set to false for ALL code chunks

Code cell options – warning

ggplot(penguins, aes(x = bill_length_mm, y = bill_depth_mm)) + 
  geom_point()
ggplot(penguins, aes(x = bill_length_mm, y = bill_depth_mm)) + 
  geom_point()
  • warning: Includes warning messages in the output.

Code cell options – eval

ggplot(penguins, aes(x = bill_length_mm, y = bill_depth_mm)) + 
  geom_point()
ggplot(penguins, aes(x = bill_length_mm, y = bill_depth_mm)) + 
  geom_point()

  • eval: Evaluates, or runs, the code.

  • Can be helpful if you are unable to fix an error before the deadline.

Code cell options – fig-width

  • fig-width: controls figure width (is a value between 1 and 10)

  • fig-width: 1 on the left, fig-width: 4 on the right

Code cell options – fig-asp

  • fig-asp: controls figure aspect ratio (is a value between 0 and 1)

  • fig-asp: 0.1 on the left, fig-asp: 0.5 in the middle, fig-asp: 1 on the right

Tables

  • Can create pretty tables using kable (uses knitr library)
mtcars |>
  group_by(cyl) |>
  summarize(
    avg_mpg = mean(mpg),
    avg_hp = mean(hp),
    count = n()
  ) |>
  kable(digits = 2, 
        caption = "Average MPG and HP by Cylinder")
mtcars |>
  group_by(cyl) |>
  summarize(
    avg_mpg = mean(mpg),
    avg_hp = mean(hp),
    count = n()
  )