MATLAB: How to detect the repetition of any number in a array

number repetition in a array

Say a=[4 5 8 9 4], How to detect this set has repeated numbers? I do not want to know the number, I just want to know that "a set has repeated numbers or not"

Best Answer

Check unique. If the length of your array and length of unique are not same it has repeated numbers.
a=[4 5 8 9 4] ;
b = unique(a) ;
if length(a)~=length(b)
    fprintf('array has repeated numbers\n')
else
    fprintf('array has no repeated numbers\n')
end
Related Question