avida-ed-library-build/docs/documentation/Topology-settings.md

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This section covers all of the basic topology variables that describe the structure of the world.
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<td valign="top"><strong><code> WORLD_X <br />WORLD_Y </code></strong></td>
<td>The settings determine the size of the Avida grid that the organisms populate; the world consists of <code>WORLD_X * WORLD_Y</code> cells. In <a href="http://avida.devosoft.org/wiki/documentation/configuration-and-command-reference/avida-cfg-the-avida-configuration-file/reproduction-settings/" title="Reproduction Settings: Birth and Death">mass action mode</a> the shape of the grid is not relevant, only the number of organisms that are in it.</td>
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See the avida.cfg file for more settings: <code>WORLD_GEOMETRY, SCALE_FREE, SCALE_FREE_ALPHA,</code> and <code>SCALE_FREE_ZERO_APPEAL</code>.