How to check for repeated values in a matrix?

I have a 3x3 matrix and i want to check if any values repeat, and if any values do not repeat then i have to check if the values are between 1 to ( r )^2 ?

How can I do that?

a=[1 4 6;2 8 9;3 5 7];

[r,c]=size(a);

Answer 1

[Adam Danz]

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 >= <=