how would I randomly replace two elements in a row vector

rn, i have:

y = char(randperm(27));

for i = 1:iter

ynew = randperm(numel(y), 2);

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Walter Roberson]

y = char(randperm(27) - 1 + 'A');
for i = 1:iter
    idx = randperm(numel(y), 2);
    ynew = y;
    ynew(idx) = ynew([idx(2) idx(1)]);
end