Data Structures in R

Question 1

5 Basic Data Structures in R?

Answer 1

Vector, Factor, List, Matrix, Data Frame

Question 2

A type of array that is one-dimensional.

Answer 2

Vector

Question 3

How to create a vector using syntax?

Answer 3

c(<element>)</element>

Question 4

Refers to a statistical data type used to store categorical variables.

Answer 4

Factor

Question 5

What syntax do you use to create a factor?

Answer 5

factor(<vector>)</vector>

Question 6

What additional arguments do you add to create an ordered factor?

Answer 6

Ordered and Levels

Question 7

This is the best choice to use when data cannot be represented as an array or a data frame.

Answer 7

list

Question 8

What syntax do you use in creating a list?

Answer 8

list(<arguments>)</arguments>

Question 9

Is a two-dimensional array of numbers having a fixed numbers of rows and columns.

Answer 9

Matrix

Question 10

What syntax do you use to create a matrix directly from a data frame?

Answer 10

table(<vector>, <vector>)</vector></vector>

Question 11

Is a table or a two-dimensional array-like structure in which each column contains values of one varibale and each row contains one set of values from each column.

Answer 11

Data Frame

Question 12

4 characteristics of Data Frame

Answer 12

Column names should be non-empty, row names should be unique, data stored in a data frame can be numeric, factor or character type, and each column should contain same number of data items

Question 13

This operator is used to denote multiple conditions.

Answer 13

&

Question 14

This function determines the number of rows in an object such as matrix, data frame, or even a dataset.

Answer 14

nrow

Question 15

The syntax to use when creating a subset?

Answer 15

subset(<dataname>, <condition>)</condition></dataname>