Brian, Yes. These errors in integration/ >> FAIL: qag(f3,31pt) oscill abserr (1.28571716286847917e-14 observed vs 1.28580546442745926e-14 expected) >> FAIL: qag(f3,31pt) oscill neval (403 observed vs 31 expected) >> FAIL: qag(f3,31pt) oscill last (7 observed vs 1 expected) go away with -O0 optimization. Hope that helps, --Matt Newville