MATLAB: How to count the occurrences of a value for an matrix

digital image processinghistogrammatrix manipulation

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

I expected the ans:

all the values must displays the number of occurences

c=unique(a);
b=[c, sum(bsxfun(@eq,a(:),c'))']

b =

Maybe you ask for this:

   D = reshape([a.' circshift(a.',-1)], [], 2);
   D(size(a,2):size(a,2):end,:)=[];
   out =[D fliplr(D)]

Come to think of it, this might be better than what I first proposed (and have now deleted)

C=accumarray(A(:),1); 
 C=C(B);

Solutions based on HISTC only work if the B(i) are sequential and increment by 1.