Finite-size scaling and the three-dimensional Ising model

We give results of an extensive finite-size-scaling analysis of the three-dimensional Ising model on lattices of size up to 443. Contrary to the results of Barber et al. [Phys. Rev. B 32, 1720 (1720)], our data show a smooth approach to the thermodynamic limit for all the lattice sizes we studied. We estimate from our data that 1/2=1.964(3). We also describe a method to implement the Metropolis algorithm using only logical commands. Our program currently achieves a speed of one spin update approximately every 11 nsec (93 million updates per second) on a 2-pipe CDC CYBER 205.