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  3. Introduction to Importing Data in R

Exercise

Reading a workbook

In the previous exercise you generated a list of three Excel sheets that you imported. However, loading in every sheet manually and then merging them in a list can be quite tedious. Luckily, you can automate this with lapply(). If you have no experience with lapply(), feel free to take Chapter 4 of the Intermediate R course.

Have a look at the example code below:

my_workbook <- lapply(excel_sheets("data.xlsx"),
                      read_excel,
                      path = "data.xlsx")

The read_excel() function is called multiple times on the "data.xlsx" file and each sheet is loaded in one after the other. The result is a list of data frames, each data frame representing one of the sheets in data.xlsx.

You're still working with the urbanpop.xlsx (view) file.

Instructions

100 XP
  • Use lapply() in combination with excel_sheets() and read_excel() to read all the Excel sheets in "urbanpop.xlsx". Name the resulting list pop_list.
  • Print the structure of pop_list.