compute centroid of a matrix

how to compute centroid of a matrix? is it possible?

Answer 1

[Matt J]

If you have the Image Processing Toolbox,

regionprops(true(size(matrix)), matrix,  'WeightedCentroid');

Otherwise,

matrix=matrix/sum(matrix(:));
[m,n]=size(matrix);
[I,J]=ndgrid(1:m,1:n);

   centroid=[dot(I(:),matrix(:)),  dot(J(:),matrix(:))]

Answer 2

[David Lieberman]

x = sum(sum(matrix).*(1:size(matrix,2)))/sum(sum(matrix))

y is computed similarly