nag_lapacklin_zptrfs (f07jvc) Example Program Data
    4             2                               : n,  nrhs
   16.0          41.0          46.0          21.0 : diagonal d
 ( 16.0, 16.0) ( 18.0, -9.0) (  1.0, -4.0)        : sub-diagonal e
 ( 64.0, 16.0) (-16.0,-32.0)
 ( 93.0, 62.0) ( 61.0,-66.0)
 ( 78.0,-80.0) ( 71.0,-74.0)
 ( 14.0,-27.0) ( 35.0, 15.0)                      : matrix B