R Data Structure

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

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