dividing a diagonal matrix into same and different diagonal elements

I have a diagonal matrix as:

V = [  0.0001  0         0        0          0;
       0       0.0001    0        0          0;
       0       0         3.6388   0          0;
       0       0         0        5.3610     0;
       0       0         0        0          6.0004];

I want to find the number of diagonal elements which are same in values. 2ndly I want to separate them in a variable, how will I do it? Here V is a 5x5 matrix, but it may be any square size matrix in general.

Answer 1

[Dyuman Joshi]

%This will give the diagonal elements in a separate variable.
z = diag(V); 

%Finding the number of repeated values 
y = unique(z);
n = histc(z,y);
x = n(n>1);     %If there are more than 1 repeating values, answer will be an array
a = y(n>1);     %Get the variables that are repeated 

[Dyuman Joshi]

z = diag(V); 

y = unique(z);
n = histc(z,y);
x = n(n>1);
a = repelem(y(n>1), n(n>1));                    %repeated values
fprintf('The same values are: %d.\n', n(n>1))   %message

[Dyuman Joshi]

I tested the function as stand-alone by giving it V1 as input and it works fine. This probably what you also said. Not sure why it doesn't run in your code. I am evaluating your code and will update here.

[Dyuman Joshi]

Is it necessary to use functions? Your code is not the optimised way to write functions.