Working with Vectors in R | Beginning R Programming – Part 7

Learn how to create a vector of values, access a specific element or elements within a vector, apply conditions to vector values, get the length of a vector, and more ways to work with vectors.

A vector is a set of values with the
same data type or what we see as a
column in a data set
this basic R object can be created in R using the C
function which combines the values to
form a vector
So let’s create a simple
vector column called animals and feed
the C function a set of values of the
same data type to form a vectors
We’ll call it, say, “animals
example here
and I’m just gonna give it a set of values
in the C function
and “bird”. That will do.
and let’s create another vector
on the weight of each animal in pounds
and just deliberately going to make this
a missing value here
now to access a
specific element or elements within a
vector we can simply use square brackets
like the same we did when we extracted
rows and columns in our data frame video
so for example…
so this here, this gets us the first element
or data value in the animals vector
we can also get a range of values in the
vector so, for example,
I’m interested in…
the first two
and we can apply conditions to
vector columns like we did in operators video
We can also use the length
function on a vector so we don’t need to
manually find or know how many values
are in a vector
we can replace missing values in a vector too
and this can be simply done by
So open those square brackets again
and we want to find
anything that is a missing value
in the weight variable of course
and we’re gonna replace them
say with the value “12”
and we can do calculations
on numeric vectors
so let’s say we want to take the
mean of “weight”
I want to average across all those weights
we can sort the elements in a vector
so, for example, you might
want to sort from lowest to highest
if it’s a numeric value or
alphabetical order
if it’s more categorical values
This sorts it in alphabetical order
you can create a new vector using a range of
numbers in a sequence so let’s
create a new variable called “class.tag” here
and we want it to have a range from 1 to 3
and finally you can organize
all your vectors into a data frame
so let’s just call our data frame
“animal.data”
and we’ll use the “data.frame” function here
and within this we are going to add all our
vectors so animals, weight
and “class.tag”
and let’s have a look at this
okay cool
and that’s the basics of vectors in R
another important object in R is
factor so let’s move on to this in the
next video

Prerequisites:
Download the Data Set
How to Install R

Part 8: 
Understanding Factors in R

Part 6: 
Data Frames

Full Series:
Beginning R Programming

More Data Science Material:
[Video] How to do the Titanic Kaggle competition in R
[Video] Introduction to dplyr
[Blog] Keeping Your Ethics in Check as a Data Scientist
[Blog] University of New Mexico Data Science Certificate Program

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Rebecca Merrett
About The Author
- Rebecca holds a bachelor’s degree of information and media from the University of Technology Sydney and a post graduate diploma in mathematics and statistics from the University of Southern Queensland. She has a background in technical writing for games dev and has written for tech publications.

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