nag_quad_2d_fin (d01dac) Example Program Results

First formulation
(User-supplied callback phi1, first invocation.)
(User-supplied callback phi2a, first invocation.)
(User-supplied callback fa, first invocation.)
Integral =    0.6667
Number of function evaluations =   189

Second formulation
(User-supplied callback phi2b, first invocation.)
(User-supplied callback fb, first invocation.)
Integral =    0.6667
Number of function evaluations =    89