Compute a randomly selected digit from a given four digit number

Question

I need to compute a randomly selected digit from a given four digit number. In this question, I use the terminology similar to “digit 3 of the number 7246 is 2” and “digit 1 of the number 7246 is 6”. That is, digit numbers count from the right, starting at 1.

Input variables:

• number is a single four digit number.

Output Variables:

• which_digit holds a random integer between 1 and 4 using randi
• digit holds the which_digit digit of number.

A sample case is:

>> number = 7246;
>> rand_digit
which_digit = 3
digit = 2

Answer 1

Combining the answers from:

• Generate a random number in a certain range in MATLAB
• Matlab: Is there a function to locate an 'n' digit in a number (i.e 2nd digit in '75673', so 5)

You could do something like:

function [which_digit, digit] = randDigit(number)
which_digit = randi([1, 4]);
digit = floor(mod(number, 10^which_digit) / 10^(which_digit-1));
end