Table's rows pow and the sum

I'm building this code I'm building this code

>> A=imread('C:\Users\ADMIN\Desktop\canada.bmp');
>> level=graythresh(A)
level =
    0.6235
>> BW=im2bw(A,level);
>> C=imcontour(BW);
>>array2table(C.', 'VariableNames', {'J', 'K'});

So far i have a table with 9540 rows and 2 colls.I want to MULTIPLY each row's data but first pow them.And then to get the final summary of all rows FOR EXAMPLE :

                        J    K
                        1    1.1
                        2    2.8
                        3    4.3
  TOTAL SUM=(1^2)*(1.1^2)+(2^2)*(2.8^2)+(3^2)*(4.30)^2

Answer 1

[dpb]

totSum=sum(C(:).^2);

or

totSum=dot(C(:),C(:));

Not sure if either has speed advantage with size or not; haven't tested for that...