XTOYS(1)                                                              XTOYS(1)



NNAAMMEE
       xtoys  -  X  window simulators for phase transitions (Ising, Potts, and
       percolation models); self-organized criticality (sandpile model);  cel-
       lular automata; wave equations.

SSYYNNOOPPSSIISS
       xxbbuurrnn    ttrreeee__ddeennssiittyy   [ --BB bblloocckk__ssiizzee ]
       xxbbuurrnn--jjaarr    ttrreeee__ddeennssiittyy   ppeerrccoollaattiioonn__pprroobbaabbiilliittyy   [ --BB bblloocckk__ssiizzee ]
       xxiissiinngg
       xxppoottttss
       xxaauuttoommaallaabb
       xxssaanndd
       xxffiirreess
       xxwwaavveess
       sscchhrrooddiinnggeerr

DDEESSCCRRIIPPTTIIOONN
       xxbbuurrnn:: simulates a  forest  fire  with  a  two-dimensional  percolation
       model.
                 ttrreeee__ddeennssiittyy  = 0 to 1; try 0.592, the critical point for 2-d
                 percolation;
                 bblloocckk__ssiizzee = 1 to 4; try 4 for a full screen view.

       xxbbuurrnn--jjaarr:: simulates a forest fire with a  two-dimensional  percolation
       model, with inclusion of a propagation probability parameter.
                 pprrooppaaggaattiioonn__pprroobbaabbiilliittyy  = 0 to 1; try .5 to see reduction in
                 burn rate and extent;
                 ttrreeee__ddeennssiittyy and bblloocckk__ssiizzee as for xburn.

       xxiissiinngg:: implements a simulation of the two dimensional Ising model with
       both local and cluster algorithms.

       xxppoottttss:: for the _q state Potts with a magnetic field.

       xxaauuttoommaallaabb:: a totalistic cellular automaton simulator; Conway's game of
       life is a special case.

       xxssaanndd:: implements the Bak, Tang, Wiesenfeld sandpile model,  illustrat-
       ing self-organized criticality.

       xxffiirreess:: a simple forest fire model of self-organized critiality.

       xxwwaavveess::  simulates  three different wave equations, representing light,
       massive mesons, and water.

       sscchhrrooddiinnggeerr:: evolves a wave function  with  the  Schrodinger  equation.
       The potential can be modified with the mouse.

       The  code  compliles under _M_a_c _O_S _X _1_0_._3 _.  Executables are included in
       this package.

OOPPTTIIOONNSS
       No command line options are implemented, except for  xburn  and  xburn-
       jar.   For  programs run without command-line parameters, adjustment of
       parameter values, if appropriate, is done within the X-window  display.

SSEEEE AALLSSOO
       The  programs are further documented in the files _r_e_a_d_m_e_._t_x_t_, _D_e_m_o___l_a_t_-
       _t_i_c_e_._t_x_t_, _x_b_u_r_n_._t_x_t_, _x_b_u_r_n_-_j_a_r_._t_x_t_, _x_f_i_r_e_s_._t_x_t_, _x_p_o_t_t_s_._t_x_t_, _x_w_a_v_e_s_._t_x_t_,
       _x_a_u_t_o_m_a_l_a_b_._t_x_t_,  _x_i_s_i_n_g_._t_x_t_,  and  _x_s_a_n_d_._t_x_t_.  The original sources are
       available        at         the         xtoys         web         page:
       _h_t_t_p_:_/_/_t_h_y_._p_h_y_._b_n_l_._g_o_v_/_w_w_w_/_x_t_o_y_s_/_x_t_o_y_s_._h_t_m_l_.


AAUUTTHHOORR
       The  xtoys  package and this manual page were written by Michael Creutz
       <creutz@bnl.gov>  (with  slight  modification  by  John  Rupley   <rup-
       ley@u.arizona.edu>).



                                   July 2005                          XTOYS(1)
