R Programming, For Beginners, Quick Start Guide. by Yao Ray

Author:Yao, Ray [Yao, Ray]
Language: eng
Format: epub
Publisher: Step by Step Tutorial eBook & Book
Published: 2020-08-05T16:00:00+00:00

unlist(　)

unlist( ) can convert a list to a vector.

Example 5.18

> myList <- list(2:6) # create a list

> print(myList)

Output:

[[1]]

[1] 2 3 4 5 6

> myVector <- unlist (myList) # conversion

> print(myVector)

Output

[1] 2 3 4 5 6

Explanation:

myVector <- unlist (myList) converts a list to a vector.

Summary

In R, a value is considered to be a vector; its length is 1.

The example to create one element vector:

> print("good") # “good” is a character vector

[1] "good"

The example to create a multiple element vector:

> print(2: 8)

[1] 2 3 4 5 6 7 8

> print(c(3,4,5))

[1] 3 4 5

seq(v1, v2, by = step) can create a vector from v1 to v2.

by = step specifies the distance among each element.

[index] can access all elements of a vector, the index starts with 1.

TRUE, FALSE, 1,0 , and all numbers can work as an index.

[-index] Assigning a negative value to an index can remove the corresponding element.

When two vectors of different lengths are manipulated, shorter vectors are treated as equal lengths.

“sort( vector, decreasing=TRUE/FALSE)” sorts elements in a vector.

list(val1, val2, val3, … ) can create a list.

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