![]() On a small enough grid, usually the CA reaches a steady state where there may be movement but nothing new happens. How many different types of gliders do you see? Why does this happen? How do the rules of the CA result in this behavior? THINGS TO TRYĪre there any stable shapes that don't move?Īre there any "glider guns" (objects that emit a steady stream of gliders)? Such patterns are often referred to as "gliders". Lots of patterns stay stable and move steadily across the grid. If you want to draw an initial pattern yourself, or alter the pattern in the middle of a run, turn on the DRAW WHITE CELLS or DRAW RED CELLS button, then "draw" and "erase" with the mouse in the view. The INITIAL-DENSITY slider determines the initial density of cells that are firing. Refractory (red) cells always die (turn black) at the next time step.Ī new firing (white) cell is born in any black cell that has exactly two firing (white) neighbors (of its eight surrounding cells). HOW IT WORKSįiring (white) cells always become refractory (red) at the next time step. ![]() This CA is especially interesting to watch because it has many configurations that move steadily across the grid (as opposed to Life, which has only relatively few such configurations). Typical CAs use two cell states (live and dead), but Brian's Brian uses three: firing (white), refractory (red), and dead (black). If you are not already familiar with 2D CA, see the model "Life" for a basic discussion. This program is an example of a two-dimensional cellular automaton. You can also Try running it in NetLogo Web If you download the NetLogo application, this model is included. Sample Models/Computer Science/Cellular Automata Beginners Interactive NetLogo Dictionary (BIND)
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