Data Structure

Data Structure - Factor

Q

What is a Factor?

✍: FYIcenter.com

A

A factor is a data structure that stores a vector and its distinct values as categories.

1. Create a factor object with the factor() function -

> f = factor( c("Bike", "Car", "Truck", "Car", "Bike", "Truck") )

> f
[1] Bike  Car   Truck Car   Bike  Truck
Levels: Bike Car Truck

> typeof(f)
[1] "integer"

> is.factor(f)
[1] TRUE

2. Get factor length and members -

> f = factor( c("Bike", "Car", "Truck", "Car", "Bike", "Truck") )

> length(f)
[1] 6

> f[4]
[1] Car
Levels: Bike Car Truck

⇒ Data Structure - Matrix

⇐ Data Structure - List

⇑ R Language Basics

⇑⇑ R Software Environment - Frequently Asked Questions

2023-05-31, 948🔥, 0💬

Data Structure - Named Vector
What is a named vector? A named vector is a special vector where each member has a unique name. A name vector is an associated array in many other programming language. 1. Create a named vector object with the name() function - > v = c("Apple", "Banana", "Orange") > v [1] "Apple" "Bana... 2023-06-11, ∼1001🔥, 0💬

Vector Is Not a Data Type
Is Vector a Data Type? No. Technically, "Vector" is not a data type. In R, all data items are technically "vectors". In other words, everything is a vector in R. There is no "scalar" data. This is why data "3" is printed out as "[1] 3" on the console, indicating that "3" is a vector of 1 member: &am... 2023-06-11, ∼954🔥, 0💬

Data Structure - Factor
What is a Factor? A factor is a data structure that stores a vector and its distinct values as categories. 1. Create a factor object with the factor() function - > f = factor( c("Bike", "Car", "Truck", "Car", "Bike", "Truck") ) > f [1] Bike Car Truck Car Bike Truck Levels: Bike Car Tru... 2023-05-31, ∼949🔥, 0💬

Data Frame Example - "cars"
What is the Data Frame Example, "cars"? "cars" is a built-in data frame example in R environment. "cars" has two columns: "speed" and "dist". Each row records an instance of the stopping distance of a car driving at a given speed. Note that the data were recorded in the 1920s. 1. Basic info on "cars... 2023-05-31, ∼947🔥, 0💬

Data Structure - Matrix
What is a Matrix? Matrix is an extension of vector into 2 dimensions 1. Create a matrix object with the matrix() function - > m = matrix(1:20, nrow=5,ncol=4) > m [,1] [,2] [,3] [,4] [1,] 1 6 11 16 [2,] 2 7 12 17 [3,] 3 8 13 18 [4,] 4 9 14 19 [5,] 5 10 15 20 > typeof(m) [1] "inte... 2023-05-31, ∼940🔥, 0💬

Data Structure - List
What is data structure "List"? List is a special vector whose members are all lists. 1. Create a list object with the list() function - > w = list( c(1,2,3), c("Apple", "Banana", "Orange")) > w [[1]] [1] 1 2 3 [[2]] [1] "Apple" "Banana" "Orange" > is.list(w) [1] TRUE > is... 2023-06-11, ∼922🔥, 0💬

Data Structure - Data Frame
What is a Data Frame? Data Frame is a generalization of matrix where columns may have different data types. Technically, a data frame is a special list. 1. Create a factor object with the data.frame() function - > name = c("Lori", "Mike", "Nill", "Sofi") > sex = factor( c("F", "M", "M"... 2023-05-31, ∼877🔥, 0💬

Basic Data Types
What are primary Data Types? There are 5 primary data types supported in R. 1. Character - Character data type represents a sequence of characters as shown below: > s = "Hello World!" > print(s) [1] "Hello World!" > is.character(s) [1] TRUE > typeof(s) [1] "character" 2. ... 2023-06-11, ∼839🔥, 0💬

Built-in Graphics Package in R Environment
Where to find answers to frequently asked questions on the Built-in Graphics Package in R Environment? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com team on the Built-in Graphics Package in R Environment: The R Graphics Package barplot() on Numeric Vector W... 2023-05-09, ∼758🔥, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.