MATLAB: How can i sum the final multiplication

Question

Hi There, when i run this code I'm left with four values for A which are the right in values, but summing the four answers all together is what I'm actually looking for. NOTE: ReducedStiffness & Qbar are both functions defined in advance thank you for your help

 clear
 Q=ReducedStiffness(5.6,1.2,0.26,0.6);
Qbarr=zeros(3,3,4);Z=zeros(1,1,4);th=[0 90 90 0];z=[0:0.005:0.02];
for ii=1:4
Qbarr(:,:,ii)=Qbar(Q,th(ii));
end
 for ii=1:4
Z(:,:,ii)=z(ii+1)-z(ii);
end
A=Qbarr.*Z;
A(:,:,1) =
    0.0284    0.0016         0
    0.0016    0.0061         0
         0         0    0.0030
A(:,:,2) =
    0.0061    0.0016   -0.0000
    0.0016    0.0284    0.0000
   -0.0000    0.0000    0.0030
A(:,:,3) =
    0.0061    0.0016   -0.0000
    0.0016    0.0284    0.0000
   -0.0000    0.0000    0.0030
A(:,:,4) =
    0.0284    0.0016         0
    0.0016    0.0061         0
         0         0    0.0030

Answer 1

S = sum(A,dim);

Reading the documentation can be useful.

If you want the sum of all elements, you can use

S = sum(A(:));