XTOYS(1) XTOYS(1) NNAAMMEE xtoys - X window simulators for phase transitions (Ising, Potts, and percolation models); self-organized criticality (sandpile model); cel- lular automata; wave equations. SSYYNNOOPPSSIISS xxbbuurrnn ttrreeee__ddeennssiittyy [ --BB bblloocckk__ssiizzee ] xxbbuurrnn--jjaarr ttrreeee__ddeennssiittyy ppeerrccoollaattiioonn__pprroobbaabbiilliittyy [ --BB bblloocckk__ssiizzee ] xxiissiinngg xxppoottttss xxaauuttoommaallaabb xxssaanndd xxffiirreess xxwwaavveess sscchhrrooddiinnggeerr DDEESSCCRRIIPPTTIIOONN xxbbuurrnn:: simulates a forest fire with a two-dimensional percolation model. ttrreeee__ddeennssiittyy = 0 to 1; try 0.592, the critical point for 2-d percolation; bblloocckk__ssiizzee = 1 to 4; try 4 for a full screen view. xxbbuurrnn--jjaarr:: simulates a forest fire with a two-dimensional percolation model, with inclusion of a propagation probability parameter. pprrooppaaggaattiioonn__pprroobbaabbiilliittyy = 0 to 1; try .5 to see reduction in burn rate and extent; ttrreeee__ddeennssiittyy and bblloocckk__ssiizzee as for xburn. xxiissiinngg:: implements a simulation of the two dimensional Ising model with both local and cluster algorithms. xxppoottttss:: for the _q state Potts with a magnetic field. xxaauuttoommaallaabb:: a totalistic cellular automaton simulator; Conway's game of life is a special case. xxssaanndd:: implements the Bak, Tang, Wiesenfeld sandpile model, illustrat- ing self-organized criticality. xxffiirreess:: a simple forest fire model of self-organized critiality. xxwwaavveess:: simulates three different wave equations, representing light, massive mesons, and water. sscchhrrooddiinnggeerr:: 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. OOPPTTIIOONNSS 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. SSEEEE AALLSSOO 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_. AAUUTTHHOORR The xtoys package and this manual page were written by Michael Creutz (with slight modification by John Rupley ). July 2005 XTOYS(1)