MATLAB: How to sum logical relations between elements of a vector

Question

I have the following problem: I need to sum logical all the logical relations of this vector:

 x= [1 2 3].

The result must be:

 res=(x(1)>x(2))+(x(1)>x(3))+(x(2)>x(3))+(x(2)>x(1))+(x(3)>x(1))+(x(3)>x(2));

In other words, res=3. I have the following code:

 x = [1 2 3];                  % Test Array                
 sumx2=0
 k = 1;                        % Add Counter Variable
 j=1;
 while j<=length(x)
    while k<=length(x) 
        sumx2=sumx2+(x(k)>x(j));
        k=k+1;
    end 
    j=j+1;
end

In this case the value of sumx2 is 2. I don't know what is wrong with the code. Please, help me.

Answer 1

You can use bsxfun to do this quite easily:

>> x = [1,2,3];
>> tmp = bsxfun(@gt,x,x(:));
>> sum(tmp(:))
ans =  3