Exercises

  1. What function would you use to read a file where fields were separated with
    "|"?

  2. Apart from file, skip, and comment, what other arguments do read_csv() and read_tsv() have in common?

  3. What are the most important arguments to read_fwf()?

  4. Sometimes strings in a CSV file contain commas. To prevent them from causing problems they need to be surrounded by a quoting character, like " or '. By default, read_csv() assumes that the quoting character will be ". What argument to read_csv() do you need to specify to read the following text into a data frame? 

    "x,y\n1,'a,b'"
  5. 
            
    Identify what is wrong with each of the following inline CSV files. What happens when you run the code?
            
    
     
    6. 




         
read_csv("a,b\n1,2,3\n4,5,6")
 read_csv("a,b,c\n1,2\n1,2,3,4")
 read_csv("a,b\n\"1")
 read_csv("a,b\n1,2\na,b")
 read_csv("a;b\n1;3")

    

 




Source: H. Wickham and G. Grolemund, https://r4ds.had.co.nz/data-import.html
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Last modified: Monday, 9 January 2023, 3:49 PM