MATLAB: Check if there are repeated elements in a vector

checkelementsrepetedsamevector

Hi to all, is there a command to check if there are repeated elements in a vector; I just have to check in an "if"…

thanks a lot

Max

   if length(v) == length(unique(v))
        % There are no repeats.
        .......

>>  V = [5 3 10];
>> [~,id] = sort(V,'descend')
id =
       3     1     2

If you're working with integers, check for repeated values using unique()

repeatsTF = numel(a) == numel(unique(a));

However, if you're dealing with floating decimals, you'll need to work in a tolerance level,

repeatsTF = numel(a) == numel(uniquetol(a));

See uniquetol() for options to set the tolerance (or use the default).

In both cases, repeatsTF returns a logical scalar (true | false) indicating whether the matrix contains repeats (false).

To check if values are between 1 to ( r )^2 ?

isBetween = all(a>1 & a<r^2, 'all');

where isBetween is true when all values of a are between (but not including) the two values. If you want to include the values, use >= <=