We present a new method devised to overcome the intrinsic
difficulties associated to the numerical simulations of the Tsallis statistics.
We use a standard Metropolis Monte Carlo algorithm at a fictitious temperature
T', combined with a numerical integration method for the calculation of the
entropy in order to evaluate the actual temperature T. We illustrate the
method by applying it to the 2d-Ising model using a standard reweighting
technique.
(Accepted in Physica A, 7 pages, 3 figures, LaTeX,
postscript version here).