MATLAB: How to build a 3d sparse matrix

matlab function

Hi everyone: As we all know these has a sparse function in matlab, for example, there has two vector:
a = [1 2 3 1 5]; b=[1 2 4 1 6];
if I use spase function like this as follow:
sn = sparse(a,b,1);
It will shows the answer like this:
ans =
     (1,1)        2
     (2,2)        1
     (3,4)        1
     (5,6)        1
the third column means the count number of conresponding row and column in a and b. So my qusetion is if it is possible to build a 3d sparse matrix as the extend of the trandtional sparse function as follow: if there has two vector:
aa = [1 2 1 1 2 3]; bb=[1 2 1 1 2 4];cc=[1 2 1 1 2 5];
snn = sparse_3d(aa,bb,cc,1);
snn=
    (1, 1, 1)  3
    (2, 2, 2)  2
    (3, 4, 5)  1
That is very nice of anyone can give me the answer. Thanks ahead! weihua

Best Answer

You could try my ndSparse class ( Download ),
    >> snn = ndSparse.build([aa',bb',cc'],1)
    snn(:,:,1) =
       (1,1)        3
    snn(:,:,2) =
       (2,2)        2
    snn(:,:,5) =
       (3,4)        1
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