R Programming

Question 1

A popular programming language used for statistical computing and graphical presentation

its most common use is to analyze and visualize data

Answer 1

R

Question 2

R is case sensitive

Answer 2

True

Question 3

R execution command

Answer 3

Ctrl a + alt enter to run/
Select + alt enter to run

Question 4

How to input string?

Answer 4

inside double quotation marks

Question 5

How to input numbers?

Answer 5

As is

Question 6

There is a multiline comment in R

Answer 6

False

Question 7

use ________________ for single line comment

Answer 7

#

Question 8

containers for storing data values

Answer 8

Variable

Question 9

R does not have a command for declaring a variable

Answer 9

True

Question 10

You do not have to use a function to output or print

Answer 10

True

Question 11

is created the moment you first assign a value to it

Answer 11

Variable

Question 12

How to assign a variable?

Answer 12

use <- assignment operator

Question 13

How to out to input or print the variable value?

Answer 13

Just type the variable name or use use print()function

variable name
Name <- “John”
Age <- 40
Name
Age

use print()

Name <- “John”
Age <- 40
print(Name)
print(Age)

Question 14

You can also ________________, or join two or more elements using the paste() function

Answer 14

Concatenate

Question 15

R allows you to assign the same value in multiple variables in one line

Answer 15

True

Question 16

You CAN use any variable name in R ptogramming

Answer 16

False
There only legal variables to use in R

Question 17

myvar <- “John”
my_var <- “John”
myVar <- “John”
MYVAR <- “John”
myvar2 <- “John”
myvar <- John

Answer 17

Legal Variable Names

Question 18

Variable should not start with number

Answer 18

True

Question 19

No other symbols other than underscore in a variable name

Answer 19

True

Question 20

There should be no white spaces in a variable name

Answer 20

True

Question 21

Variable name should not start with underscores

Answer 21

True

Question 22

no other symbols other than underscore

Answer 22

True

Question 23

2myvar <- “John”
should not start with number

my-var <- “John”
no other symbols other than underscore

my var <- “John”
no white spaces

_my_var <- “John”
should not start with underscores

my_v@ar <- “John”
no other symbols other than underscore

TRUE <- “John”
do not use a reserved code, in this case it is Boolean

Answer 23

Illegal Variable Names

Question 24

We can use the ____________function to check the data type

Answer 24

class()

Question 25

number followed by L

Answer 25

Integer

Question 26

Numeric data without decimals

Answer 26

Integer

Question 27

Used when you are certain that you will never create a variable that could contain a decimal

Answer 27

Integer

Question 28

A ____________ number is written with an “i” as the imaginary part

Answer 28

Complex

Question 29

You can convert from one type to another

Answer 29

True

Question 30

You can convert from one type to another with the following functions:

Answer 30

as.numeric()
as.integer()
as.complex()

Question 31

There are three basic constructs to consider:

Answer 31

Iteration - repeated until condition is met
Sequence - top to bottom
Selection or conditional - selected conditionally

Question 32

Three condition statements

Answer 32

if statement
Else if statement
If else statement

Question 33

R also has many ____________ functions that allows you to perform mathematical tasks on numbers

Answer 33

Built-in Math Functions

Question 34

____________ and ____________ functions can be used to find the lowest or highest number in a set

Answer 34

the min() and max()

Question 35

Built-in Math Functions that gets the square root of a number

Answer 35

sqrt()

Question 36

gets the non-negative value of the inputted value

Answer 36

abs()

Question 37

returns the smallest integer that is greater than or equal to the number whose ceiling needs to be calculated

Answer 37

ceiling()

Question 38

returns the largest integer that is smaller than or equal to value passed to it as argument

Answer 38

floor()

Question 39

series of statements are skipped and jumps to another statement under a particular condition

Answer 39

Branching

Question 40

Ilegal Variable Names

Answer 40

should not start with number
no other symbols other than underscore
no white spaces
should not start with underscores
no other symbols other than underscore
do not use a reserved code, in this case it is Boolean