integrating x*x+y*y<0.9*0.9?1:0 with N=10000
pseudo-random:
integral = 0.646000 error estimate = 0.004782
exact    = 0.636173 actual error   = 0.009827
quasi-random:
integral = 0.635900 error estimate = 0.000700
exact    = 0.636173 actual error   = 0.000273