nag_sparse_sym_sort (f11zbc) Example Program Results
 Original elements 
 nnz =       9
        1      1.0000e+00       3       2
        2      0.0000e+00       2       1
        3      1.0000e+00       3       2
        4      3.0000e+00       4       4
        5      4.0000e+00       1       1
        6      6.0000e+00       2       2
        7      2.0000e+00       3       3
        8      1.0000e+00       3       2
        9      1.0000e+00       3       2
 Reordered elements 
 nnz =    5
        1      4.0000e+00       1       1
        2      6.0000e+00       2       2
        3      4.0000e+00       3       2
        4      2.0000e+00       3       3
        5      3.0000e+00       4       4