Rearranging matrix based on coordinates

I have three matrixes, one containing x values and one for y values of trajectories. I also have a matrix with mass corresponding to these location. I know want to sort the mass values into a new matrix based on the coordinates, filling the empty spots with zeros.

Example.

x = [1, 2, 3; 1, 2, 3; 1, 2, 3]

y = [1, 2, 2; 1, 1, 3; 3, 2, 1]

mass = [1, 12, 0; 2, 5, 6; 0, 1, 3]

new matrix would be A = [1+2,5,3; 0, 12+1, 0; 0, 0, 6]

I have been trying to create a for-loop to create this.

    % code
A= zeros(3,3) 
for i=1:3 
for j=1:3
if x==i & y==j
A(i,j) = mass ( -- not sure how to indicate the point to get mass from) 
  end
end 
end

Thanks!

[Azzi Abdelmalek]

This is not clear

Answer 1

[Andrei Bobrov]

A = accumarray([y(:),x(:)],mass(:))

[Elise]

Thanks, that worked out perfectly!

I notice that for this to work all numbers must be integers, is there a similar and easy way if dealing with decimals?

[Andrei Bobrov]

x and y - must be integers