Function qagp
void qagp(Real, Func)
(
Func f,
Real a,
Real b,
int npts2,
const Real* points,
Real epsabs,
Real epsrel,
out Real result,
out Real abserr,
out int neval,
out int ier,
int leniw,
int lenw,
out int last,
int* iwork,
Real* work
);