MATLAB Answers

random letter bother upper & lower case

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How do I create a random letter both upper or lower case?
I know how do to do it for a number
number = randi([1,50])
% gives me a random number in the range of 1 to 50
Can I use something similer to create a random single upper or lower case letter? My code below is fine, but I have the input function which allows me to maunally pick a letter.
But I dont want to manually pick a letter, how do I get a random upper or lower letter without manually picking one?
clc, clear all, close all
letter = input('Enter a letter: ', 's');
if letter == 'x'
elseif letter == 'y' || letter == 'Y'
elseif letter == 'Q'

Accepted Answer

millercommamatt on 24 Jun 2021
This is a fun puzzle. Upper-case letters run of 65-90 in an ASCII table and lower-case runs from 97 to 122. You can use char to convert from the number to the equivalent ascii character.
randomletter = char(randi([65,95]) + randi([0,1]).*32);

More Answers (1)

Steven Lord
Steven Lord on 24 Jun 2021
uppercase = 'A':'Z';
lowercase = 'a':'z';
letters = [uppercase lowercase];
whichLetters = randi(numel(letters), 1, 10)
whichLetters = 1×10
6 1 31 40 43 34 51 26 42 48
randomLetters = letters(whichLetters)
randomLetters = 'FAenqhyZpv'
Elements in whichLetters that are less than or equal to numel(uppercase) are drawn from the uppercase variable and those that are greater are drawn from lowercase. Alternately you could treat letters like a "deck of cards" and shuffle it. This would let you draw letters without replacement. randomLetters as created above could have duplicates.
shuffledOrder = randperm(numel(letters));
shuffledLetters = letters(shuffledOrder)
shuffledLetters = 'JlQjTzVopnsHXOqiLPcewyUGuImBrWakFhADgbYxdvMfNtCSEKRZ'

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