nag_sparse_nsym_sort (f11zac) Example Program Results
 Original elements 
 nnz =      15
        1      4.0000e+00       3       1
        2     -2.0000e+00       5       2
        3      1.0000e+00       4       4
        4     -2.0000e+00       4       2
        5     -3.0000e+00       5       5
        6      1.0000e+00       1       2
        7      0.0000e+00       1       5
        8      1.0000e+00       3       5
        9     -1.0000e+00       2       4
       10      6.0000e+00       5       5
       11      2.0000e+00       1       1
       12      2.0000e+00       4       2
       13      1.0000e+00       2       3
       14      1.0000e+00       3       3
       15      2.0000e+00       4       5
 Reordered elements 
 nnz =   11
        1      2.0000e+00       1       1
        2      1.0000e+00       1       2
        3      1.0000e+00       2       3
        4     -1.0000e+00       2       4
        5      4.0000e+00       3       1
        6      1.0000e+00       3       3
        7      1.0000e+00       3       5
        8      1.0000e+00       4       4
        9      2.0000e+00       4       5
       10     -2.0000e+00       5       2
       11      3.0000e+00       5       5