Sparse Function for any matrix

edited October 2013 in Matlab

I am trying to write a sparse function code for any matrix size. For example if i have a matrix:

        A = [ 0   0   0   5
              0   2   0   0
              1   3   0   0
              0   0   4   0];
          a=size(A);
          b=size(A);
          c=0;
          position=0;
          for i=1:a for j=1:b if A(i,j) ~=0
                      c=c+1;
                      position=position+1;
                      S(c,:)=[position,i,j,A(i,j)];
                  end
              end
          end
        S

S --> is the storage matrix for all the non zero elements for A matrix. In addition to this information(Index,Row Number, Column Number, Value) how do I include two more columns in the matrix which shows the next element in row & the next element in column.

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