Title: "[[R-Data-Structure]]"
Author:
  - AllenYGY
status: DONE
tags:
  - NOTE
  - R
  - Lec1
  - Program
created: 2023-12-27T01:56
updated: 2024-05-31T01:13

R-Data-Structure

vector
list
matrix
array
data frame
factor

Vector

A vector is simply a list of items that are of the same type.

To combine the list of items into a vector, use the c() function and separate the items by a comma.

# Vector of strings
fruits <- c("banana", "apple", "orange")

# Print fruits
fruits

output:

[1] "banana" "apple"  "orange"

# Vector with numerical values in a sequence
numbers <- 1:10

numbers

output:

[1]  1  2  3  4  5  6  7  8  9 10

# Vector with numerical decimals in a sequence
numbers1 <- 1.5:6.5
numbers1

# Vector with numerical decimals in a sequence where the last element is not used
numbers2 <- 1.5:6.3
numbers2

output:

[1] 1.5 2.5 3.5 4.5 5.5 6.5
[1] 1.5 2.5 3.5 4.5 5.5 6.3

默认步长为1，即每一个元素都相隔一个单位。

Length of a vector

fruits <- c("banana", "apple", "orange")

length(fruits)

To create a vector of numbers, use the seq() function.

# Vector of numbers
numbers <- seq(1, 10)

# Print numbers
numbers

output

[1]  1  2  3  4  5  6  7  8  9 10