MATLAB: What’s wrong with the bubble code

octave

clc
function y = sort( v )
    n = length( v );
    sorted = 0;
    k = 0;
    
    while ~sorted
        sorted = 1;
        k = k + 1;
        for j = 1:n-k
            if v(j) > v(j + 1)
                t = v(j);
                v(j) = v(j + 1);
                v(j + 1) = t;
                sorted = 0;
            end
        end
    end
    y = x;
Got it from https://www.mathworks.com/matlabcentral/answers/232059-can-someone-help-me-understand-bubble-sort#answer_187979
This code ain't doing shit guys. What's wrong? Should I put v = input( 'vector? ' ) before the function or something? What's the point of the y = x;?

Best Answer

The red markers in the right column indicates that something is seriously wrong
Right click function
(There is already a function named sort in Matlab. Pick another name. )
Remove the first line (and add end as the last line).
Try 
function y = my_sort( v )
    n = length( v );
    sorted = 0;
    k = 0;
    
    while ~sorted
        sorted = 1;
        k = k + 1;
        for j = 1:n-k
            if v(j) > v(j + 1)
                t = v(j);
                v(j) = v(j + 1);
                v(j + 1) = t;
                sorted = 0;
            end
        end
    end
    y = x;
end
I get
Cannot find an exact (case-sensitive) match for 'x
The closest match is: X in H:\m\cssm\X.m
Error in my_sort (line 19)
    y = x;
Replace
    y = x;
by
    y = v;
and try again
>> my_sort( randi(12,1,6) )
ans =
     2     4     7    12    12    12
>>
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