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WithoutBook LIVE Mock Interviews R Language Related interview subjects: 9

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Know the top R Language interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Know the top R Language interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Freshers / Beginner level questions & answers

Ques 6

What is the purpose of the 'str()' function in R?

The 'str()' function is used to display the structure of an R object. It provides a compact way to see the internal structure of data objects in R.

Example:

str(my_data)
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Ques 8

Explain the purpose of the 'ggplot2' package in R.

'ggplot2' is a popular data visualization package in R that allows users to create complex and customized plots with a grammar of graphics approach.

Example:

library(ggplot2)
 ggplot(data = my_data, aes(x = variable1, y = variable2)) + geom_point()
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Ques 9

What is the difference between 'ls()' and 'objects()' functions in R?

'ls()' and 'objects()' both list objects in the current environment, but 'ls()' is a shorthand form of 'objects()' and has additional options.

Example:

ls()
# or
objects()
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Ques 11

What is the purpose of the 'setwd()' function in R?

The 'setwd()' function is used to set the working directory in R. It changes the current working directory to the specified path.

Example:

setwd('/path/to/directory')
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Ques 12

How can you install and load a package in R using a single command?

You can use the 'install.packages()' and 'library()' functions in a single line to install and load a package.

Example:

install.packages('my_package'); library('my_package')
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