Intro To R

Question 1

What is an algorithm

Answer 1

Question 2

What is pseudo code

Answer 2

Word that is cutout is perform*

Question 3

What are the different variable types

Answer 3

Information is stored as variables

(Cut off) Boolean*

Question 4

What are vectors

Answer 4

A vector is a list of variables
Same data type
One dimensional

Question 5

What is a matrix

Answer 5

Is a collection of elements of the same data type arranged into a fixed number of towns and columns
2 dimensional

Question 6

What is an array

Answer 6

Is an object that can hold two or more than 2 dimensional data

Question 7

What are data frames

Answer 7

2 dimensional
Rectangular
Used to store values of any data tye

Question 8

What is R syntax

Answer 8

Question 9

how do you assign a variable

Answer 9

using <-
e.g a <- 4
this would store 4 as a variable of a
a is the name of the variable

Question 10

how do you times two variables

Answer 10

variable * variable
e.g a * a

Question 11

how would you square root a variable

Answer 11

sqrt(variable name)

Question 12

how would you store a concatentation under a vector

Answer 12

variable name <- c( )

e.g v <- c(0, 1, 2, 3, 4)

Question 13

what does # mean

Answer 13

any text after # is ignored
is used for commenting

Question 14

what is concatenation

Answer 14

c()(concatenate) is one of the most commonly used R functions because it is the default method for combining multiple arguments into a vector

Question 15

how can you check if something is a vector

Answer 15

is.vector(v)

Question 16

how do you find the mean of your vector

Answer 16

mean(v)

Question 17

what is a vector

Answer 17

vector is like a single column or row in a spreadsheet

Question 18

what are the different operations that can be carried out on vectors

Answer 18

var(v) - variance
median(v) - median
sum(v) - sum of all elements
prod(v +1) - multiply
length(v)- how many elements are in the vector