nag_lapacklin_zptrfs (f07jvc) Example Program Results Solution(s) 1 2 1 ( 2.0000, 1.0000) (-3.0000,-2.0000) 2 ( 1.0000, 1.0000) ( 1.0000, 1.0000) 3 ( 1.0000,-2.0000) ( 1.0000,-2.0000) 4 ( 1.0000,-1.0000) ( 2.0000, 1.0000) Backward errors (machine-dependent) 0.0e+00 0.0e+00 Estimated forward error bounds (machine-dependent) 9.0e-12 6.1e-12