nag_sparse_real_gen_precon_ilu (f11dac) Example Program Results
  Original Matrix 
  n     =      4
  nnz   =     11
       1    1.000000e+00       1       2
       2    1.000000e+00       1       3
       3   -1.000000e+00       2       1
       4    2.000000e+00       2       3
       5    2.000000e+00       2       4
       6    3.000000e+00       3       1
       7   -2.000000e+00       3       4
       8    1.000000e+00       4       1
       9   -2.000000e+00       4       2
      10    1.000000e+00       4       3
      11    1.000000e+00       4       4

  Factorization 
  n     =      4
  nnz   =     11
  npivm =      0
      12    1.000000e+00       1       1
      13    1.000000e+00       1       3
      14    3.333333e-01       2       2
      15   -6.666667e-01       2       4
      16   -3.333333e-01       3       2
      17    5.000000e-01       3       3
      18    6.666667e-01       3       4
      19   -2.000000e+00       4       1
      20    3.333333e-01       4       2
      21    1.500000e+00       4       3
      22   -3.000000e+00       4       4

         i       ipivp[i-1]  ipivq[i-1] 
         1         1         2
         2         3         1
         3         2         3
         4         4         4