nag_sparse_real_gen_matvec (f11xac) Example Program Data
  5                     : n
 11                     : nnz
  2.   1    1
  1.   1    2
  1.   2    3
 -1.   2    4
  4.   3    1
  1.   3    3
  1.   3    5
  1.   4    4
  2.   4    5
 -2.   5    2
  3.   5    5           : (a, irow, icol)[i], i=0,...,nnz-1
 0.70
 0.16
 0.52
 0.77
 0.28                   : x[i], i=0,...,n-1
 Nag_NoTrans            : trans
 Nag_SparseNsym_Check   : check
 Nag_Trans              : trans
 Nag_SparseNsym_NoCheck : check