Data Structure - Named Vector

Q

What is a named vector?

✍: FYIcenter.com

A

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"  "Banana" "Orange"

> names(f) = c("First", "Second", "Third")
> v
   First   Second    Third
 "Apple" "Banana" "Orange"

2. Get members by index and by name -

> v["Second"]
 Second
"Banana"

> f[2]
 Second
"Banana"

⇒ Data Structure - List

⇐ Vector Is Not a Data Type

⇑ R Language Basics

⇑⇑ R Software Environment - Frequently Asked Questions

2023-06-11, ∼1966🔥, 0💬

R Language Basics
Where to find answers to frequently asked questions on understanding R language basic concepts? Here is a list of frequently asked questions and their answers compiled by FYIcenter.com team on understanding R language basic concepts: Basic Data Types Data Structure - Vector Vector Is Not a Data Type... 2023-07-29, ∼1893🔥, 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, ∼1856🔥, 0💬

Data Structure - Vector
What is data structure "Vector"? Vector is a special data structure that represents a sequence of data elements of the same data type. A vector is an array in many other programming language. 1. Create a vector object with the c() function - > v = c("Apple", "Banana", "Orange") > print... 2023-06-11, ∼1841🔥, 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, ∼1780🔥, 0💬

Run R Code Online
How to Run R Code Online? If you don't want to install the R environment on you local computer, you run your R code online as shown in this tutorial. 1. Go to R Package Documentation Website . 2. Click "Run R Code Online" button on the page. You see a sample code in an editor window. 3. Click "Run (... 2023-07-29, ∼1767🔥, 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, ∼1766🔥, 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, ∼1745🔥, 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, ∼1743🔥, 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, ∼1658🔥, 0💬

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