Chapter 13 - Davidson Physics

CHAPTER 14. FRACTALS AND KINETIC GROWTH MODELS 523ggggxggggxggggggxggggggggggggggggggggxgxxggxgxggxgxggxggFigure 14.3: An example of the growth of a percolation cluster. Sites are occupied with probabilityp. Occupied sites are represented by a shaded square, growth or perimeter sites are labeled by g,and tested unoccupied sites are labeled by x. Because the seed site is occupied but not tested,we have represented it differently than the other occupied sites. The growth sites are chosen atrandom.public int L ;public double p ; // s i t e occupation p r o b a b i l i t yint occupiedNumber ;int perimeterNumber ;int nx [ ] = {1 , −1, 0 , 0 } ; // r e l a t i v e change in x to n e a r e s t n e i g h b o r sint ny [ ] = {0 , 0 , 1 , −1}; // r e l a t i v e change in y to n e a r e s t n e i g h b o r sdouble mass [ ] ; // mass o f ring , index i s d i s t a n c e from c e n t e r o f masspublic void i n i t i a l i z e ( ) {s i t e = new byte [ L+2][L+2]; // g i v e s s t a t u s o f each s i t exs = new int [ L*L ] ; // l o c a t i o n o f occupied s i t e sys = new int [ L*L ] ;pxs = new int [ L*L ] ; // l o c a t i o n o f perimeter s i t e spys = new int [ L*L ] ;for ( int i = 0 ; i