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R for Data Analytics MCQ - Data Manipulation with R

6 Which function combines objects side by side as columns?

cbind() combines objects by columns.

7 How can a new column named total be added to a data frame df?

A new data frame column can be created directly with the $ operator and assignment.

8 Which command renames all columns of df by assigning a character vector?

Assigning a character vector to names(df) changes the data frame column names.

9 Which function sorts a vector and returns the sorted values?

sort() returns the values of a vector in sorted order.

10 What does order(x) return?

order() returns the positions needed to rearrange values into sorted order.

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Question:

Which function combines objects side by side as columns?

A. rbind()
B. cbind()
C. merge.rows()
D. stackrows()

Correct answer: B

Explanation:

cbind() combines objects by columns.

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