Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / miscellaneous-1.1.0 / gameoflife.m

diff --git a/octave_packages/miscellaneous-1.1.0/gameoflife.m b/octave_packages/miscellaneous-1.1.0/gameoflife.m
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+## Copyright (C) 2010 VZLU Prague, a.s.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 3 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn{Function File} {B =} gameoflife (A, ngen, delay)
+## Runs the Conways' game of life from a given initial state for a given
+## number of generations and visualizes the process.
+## If ngen is infinity, the process is run as long as A changes.
+## Delay sets the pause between two frames. If zero, visualization is not done.
+## @end deftypefn
+
+function B = gameoflife (A, ngen, delay = 0.2)
+  B = A != 0;
+  igen = 0;
+  CSI = char ([27, 91]);
+
+  oldpso = page_screen_output (delay != 0);
+  unwind_protect
+
+    if (delay > 0)
+      puts (["\n", CSI, "s"]);
+      printf ("generation 0\n");
+      colorboard (! B);
+      pause (delay);
+    endif
+
+    while (igen < ngen)
+      C = conv2 (B, ones (3), "same") - B;
+      B1 = C == 3 | (B & C == 2);
+      igen++;
+      if (isinf (ngen) && all ((B1 == B)(:)))
+        break;
+      endif
+      B = B1;
+      if (delay > 0)
+        puts (["\n", CSI, "u"]);
+        printf ("generation %d\n", igen);
+        colorboard (! B);
+        pause (delay);
+      endif
+    endwhile
+
+  unwind_protect_cleanup
+    page_screen_output (oldpso);
+  end_unwind_protect
+
+endfunction