Question

Each element of a data frame can be thought of as a ___ and the length of each element is the ___.

A. vector, number of rows.
B. column, number of columns.
C. row, number of rows.
D. row, number of columns.

Answer 1

The elements of a data frame are considered as either rows or columns, and their length represents the number of columns.

Step-by-step explanation:

A.

Each element of a data frame can be thought of as a row and the length of each element is the number of columns.

B.

A column in a table or the axis of a graph is conveniently labeled with a quantity and its units. In this case, the quantity represents the number of columns in the data frame.

Therefore, the correct answer is B. column, number of columns.