LETTERS in R

LETTERS represent the 26 upper-case character letters from A-Z of the alphabet. It is one of the built-in constants in R. This guide shows you how to create a sequence of letters in R using LETTERS.

Creating a sequence of all upper-case letters

You will get all 26 alphabets in upper-case using the LETTERS function. Make sure to type the syntax in upper-case.

Syntax

``LETTERS``

Example

``````LETTERS
print(LETTERS)``````

Output

``````> print(LETTERS)
[1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S"
[20] "T" "U" "V" "W" "X" "Y" "Z"``````

Creating a subsequence of upper-case letters

We can return a subsequence of upper-case letters using an index. As there are 26 letters in the alphabet, the index begins with 1 and ends with 26.

Syntax

``LETTERS[start:end]``

Example

Let us say you want to print the upper-case alphabet from the fifth to the tenth letter of the alphabet.

``print(LETTERS[5:10])``

Output

``````> print(LETTERS[5:10])
[1] "E" "F" "G" "H" "I" "J"``````

Creating a random sequence of upper-case letters

You can create a random sequence of letters of a specific size using the sample() function.

Syntax

``sample(LETTERS, size)``

Here, LETTERS represents the upper-case letters, and size represents the number of random letters.

Example

``print(sample(LETTERS,5))``

Output

``````> print(sample(LETTERS,5))
[1] "F" "O" "R" "Q" "E"``````