read.csv and write.csv in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read a CSV file named 'data.csv' into a variable called df.

R Programming

df <- [1]("data.csv")

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Awrite.table

Bwrite.csv

Cread.table

Dread.csv

Attempts:

3 left

💡 Hint

Common Mistakes

Using write.csv instead of read.csv

Using read.table without specifying separator

The read.csv function reads CSV files into R as data frames.

2fill in blank

medium

Complete the code to save the data frame df to a CSV file named 'output.csv'.

R Programming

[1](df, "output.csv")

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Aread.csv

Bsave.csv

Cwrite.csv

Dexport.csv

Attempts:

3 left

💡 Hint

Common Mistakes

Using read.csv instead of write.csv

Using save.csv which does not exist

The write.csv function saves data frames to CSV files.

3fill in blank

hard

Fix the error in the code to read a CSV file with headers.

R Programming

df <- read.csv("data.csv", [1] = TRUE)

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Aheader_row

Bheader

Chead

Dheaders

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'headers' instead of 'header'

Using 'head' which is a different function

The correct argument to specify that the CSV file has headers is header.

4fill in blank

hard

Fill both blanks to read a CSV file with semicolon separator and save it back with row names excluded.

R Programming

df <- read.csv("data.csv", sep = [1])
write.csv(df, "output.csv", row.names = [2])

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A";"

BTRUE

CFALSE

D","

Attempts:

3 left

💡 Hint

Common Mistakes

Using comma as separator when file uses semicolon

Setting row.names to TRUE which includes row names

To read a CSV with semicolon separator, use sep = ";". To exclude row names when saving, use row.names = FALSE.

5fill in blank

hard

Fill all three blanks to read a CSV file without converting strings to factors, then write it with UTF-8 encoding and no row names.

R Programming

df <- read.csv("data.csv", stringsAsFactors = [1])
write.csv(df, "output.csv", fileEncoding = [2], row.names = [3])

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ATRUE

BFALSE

C"UTF-8"

D"ASCII"

Attempts:

3 left

💡 Hint

Common Mistakes

Leaving stringsAsFactors as TRUE causing factors

Using wrong encoding like ASCII

Including row names unintentionally

Set stringsAsFactors = FALSE to keep strings as characters. Use fileEncoding = "UTF-8" to write with UTF-8 encoding. Set row.names = FALSE to exclude row names.