nag_1d_quad_inf_1 (d01smc) Example Program Results (User-supplied callback f, first invocation.) a - lower limit of integration = 0.0000 b - upper limit of integration = infinity epsabs - absolute accuracy requested = 0.00e+00 epsrel - relative accuracy requested = 1.00e-04 result - approximation to the integral = 3.14159 abserr - estimate of the absolute error = 2.65e-05 qp.fun_count - number of function evaluations = 285 qp.num_subint - number of subintervals used = 10