A) Prepare for in-class exercises

The apply family of functions

Watching all videos for this section takes ~ 44 min.

Hint: Watch the videos with a higher reproduction speed to save some time.

Instructions

• Create a new Rmd file, save it in your document folder with the name "apply-prep.Rmd".
• Write a title for this section (using a first level header, indicated with one hashtag followed by a blank space # )
• After (or during) watching each video, write the code that is being explained by the virtual instructor in your Rmd file.
  • Write a subtitle before the code section of each video (as a second level header indicated with two hastags followed by a blank space ## ).
  • Write each piece of code explained in the video in its own R chunk.
  • ⚠️ If the code gives an error or does not run, you can tell R not to run it by using the option eval = FALSE inside the R chunk:

    ```{r, eval = FALSE}
    your code that does not run goes here.
    ```
    

• Knit to pdf.
• Git add, commit and push both files (Rmd and PDF).

1. Watch the 4min 11s video Introduction to repeating things in R.
   • Write a subtitle header for this section.
   • Write and run the code that was explained on the video.
2. Watch the 11min 32s video Using vectorized functions.
   • Write a subtitle header for this section.
   • Write and run the code that was explained on the video.
3. Watch the 8min 38s video Apply functions.
   • Write a subtitle header for this section.
   • Write and run the code that was explained on the video.
4. Watch the 5min 31s video The mapply function.
   • Write a subtitle header for this section.
   • Write and run the code that was explained on the video.
5. Watch the 15min 07s video Combining functions with dplyr.
   • Write a subtitle header for this section.
   • Write and run the code that was explained on the video.