nag_sparse_sym_sort (f11zbc) Example Program Data
  4                   n
  9                   nnz
  1.0   3    2
  0.0   2    1
  1.0   3    2
  3.0   4    4
  4.0   1    1
  6.0   2    2
  2.0   3    3
  1.0   3    2
  1.0   3    2         a[i-1], irow[i-1], icol[i-1], i=1,...,nnz