Excel files with readxl in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the readxl package in R?

The readxl package is used to read Excel files (.xls and .xlsx) into R easily without needing external dependencies.

beginner

How do you read the first sheet of an Excel file named data.xlsx using readxl?

Use readxl::read_excel("data.xlsx"). By default, it reads the first sheet.

beginner

How can you specify which sheet to read from an Excel file using readxl?

Use the sheet argument in read_excel(). It accepts either the sheet name as a string or the sheet number as a number.

intermediate

What does the range argument do in read_excel()?

The range argument lets you specify a cell range (like "A1:D10") to read only a part of the sheet.

intermediate

How does readxl handle column types when reading Excel files?

readxl guesses column types automatically but you can override this by using the col_types argument to specify types like "text", "numeric", or "date".

Which function from readxl reads Excel files into R?

A read_xlsx()

B read.csv()

C read.table()

D read_excel()

read_excel() is the main function in readxl to read Excel files.

How do you read the second sheet of an Excel file using readxl?

A read_excel("file.xlsx", sheet = "second")

B read_excel("file.xlsx", sheet = "2")

C read_excel("file.xlsx", sheet = 2)

D read_excel("file.xlsx", sheet = TRUE)

The sheet argument accepts the sheet number as a number, so sheet = 2 reads the second sheet.

What file types can readxl read?

A .csv and .txt

B .xls and .xlsx

C .json and .xml

D .doc and .pdf

readxl reads Excel files with extensions .xls and .xlsx.

If you want to read only cells A1 to C5 from a sheet, which argument do you use?

A range = "A1:C5"

B cells = "A1:C5"

C area = "A1:C5"

D select = "A1:C5"

The range argument specifies the cell range to read.

How can you tell readxl to treat a column as text?

A col_types = c("text")

B col_types = "text"

C col_types = list("text")

D col_types = text

You provide a vector of column types like col_types = c("text") to specify column types.

Explain how to read a specific sheet from an Excel file using the readxl package.

Think about how you tell the function which sheet to open.

Describe how you can read only a part of an Excel sheet with readxl.

Focus on limiting the cells you want to import.