Lesson 1

Question 1

What are objects/variables?

Answer 1

Named data structures that store data

Question 2

What are objects/variables in R?

Answer 2

Call the data stored in an object

Question 3

What is R?

Answer 3

An object oriented programming language?

Question 4

What can objects be?

Answer 4

Single digit, character, a Boolean, data frame, a list of data frame, matrix,vector etc.

Question 5

hashtag/# in R?

Answer 5

Tells R what follows is NOT executable code

Question 6

How to create an object?

Answer 6

Object name <- value

Question 7

What is a numeric vector?

Answer 7

One dimensional arrays

Question 8

What is R arithmetic order by operations?

Answer 8

First: Exponent or root, second: multiplication or division, third: addition or subtraction

Question 9

What are vector?

Answer 9

A sequence of data elements that are of the same type

Question 10

What are the type of vector?

Answer 10

Integer, double, charater, logical, complex, raw

Question 11

What is the assignment operator?

Answer 11

The left pointing arrow and the dash or minus (<-)

Question 12

What are variables and functions names in R composed of?

Answer 12

Letters (a-z, A-Z), numerals (0-9), periods (.), and underscores (_), and they may be arbitrarily long.

Question 13

What is an integers?

Answer 13

Whole numbers; with nothing after the decimal

Question 14

What are double?

Answer 14

Doubles store regular numbers (large, small, positive, negative, with digits after the decimal, or without)

Question 15

(String)The elements of character vectors; can be…

Answer 15

Letters, numbers, or symbols

Question 16

Logical vector stores

Answer 16

Boolean data (True or False)

Question 17

Coercion rules:

Answer 17

If a vector has even one string element, all other elements will be converted to strings

Question 18

How does function operate function.name(x)

Answer 18

Runs the function called function.name on the data x

Question 19

Function is R…

Answer 19

Store a command instead of data

Question 20

What is the function format?

Answer 20

Name + body of code + arguments