Exercises – Basics (Introduction to R)

Author

Affiliation

Jürgen Wilbert

University of Münster

Basic concepts

1. Create a numeric vector x with five values and compute its mean and standard deviation using base R.
2. Create a character vector id and a logical vector passed each of four elements. Combine them into a data.frame and inspect with str().
3. Use names() to assign column names to a data frame you created and verify with names(dat).
4. Create a q_1, q_2, q_3 up to q_25 two times with paste() and with paste0().
5. Compute the square root of 2, the exponential of 1, and the natural logarithm of 10.
6. Create a list with three heterogeneous elements (numeric, character, logical). Access elements by name and by position.
7. Use factor() to create a factor with levels A and B. Show the internal integer representation with as.numeric().
8. Add comment lines to three of the previous tasks. Use # for each line.
9. Add three section headers to your R script using # ---- separators that help to organise your text.
10. Open the help page for rank with ?rank and summarize what it does.