for O(2) symmetry 
Spins with one components: S=x local field : h_{local}=(h_{local}^{x}) Energy=S.h_{local}=h_{local}.x P(x)=e^{Energy/T}.dx =e^{h.x}.dx 
The Alias Walker Hasting (AWH) Algorithms use the rejection method with a function consisting of n steps (see the figure and article for more details). In this page (AWH_*) the probability to produce the alias is made of a histogram at one temperature. It is therefore an average of all values of the local field at this temperature. 
1.  To use the Alias Walker (AW) and Alias Walker Hasting (AWH) Algorithms you must have :  


2.  AND you must have the tables in the file "XX_walker_histo.res". Two choices: . You can choose to download the file O2_walker.res already done or make one with create_O2_walker.c  


