MATLAB: Sum every 2 pages at a time in 3D matrix

3d datasum

I'm trying to sum every 2 pages at a time in 3D data.
for example, suppose I have 3x2x5 double data like this:
data = ones(3,2,5);
after I sum every 2 pages then I can get 3x2x3 double data like this:
data(:,:,1) =
     2     2
     2     2
     2     2
data(:,:,2) =
     2     2
     2     2
     2     2
data(:,:,3) =
     1     1
     1     1
     1     1
I'm not sure you can understand what I'm saying..please leave comment if you need more explanation.
The JPG file I attached(pic.jpg) might help you understand.
Many thanks to all

Best Answer

Another way:
p = 2; % number of pages at a time to sum
datas = data;
m = mod(size(datas,3),p);
if( m )
    datas(end,end,end+p-m) = 0; % pad if needed
end
datas = reshape(datas,size(datas,1),size(datas,2),p,size(datas,3)/p);
result = sum(datas,3);
result = reshape(result,size(data,1),size(data,2),[]);
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