Minor improvements in Makefile

[linpy.git] / examples / menger.py

diff --git a/examples/menger.py b/examples/menger.py
index b6ab90d..dcba976 100755 (executable)
--- a/examples/menger.py
+++ b/examples/menger.py
@@ -1,21 +1,17 @@
 #!/usr/bin/env python3
 
-"""
-    This file is part of Linpy.
-
-    Linpy 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.
-
-    Linpy 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 Linpy.  If not, see <http://www.gnu.org/licenses/>.
-"""
+# Plot a Menger sponge.
+#
+# The construction of a Menger sponge can be described as follows:
+#
+# 1. Begin with a cube.
+# 2. Divide every face of the cube into 9 squares, like a Rubik's Cube. This
+#    will sub-divide the cube into 27 smaller cubes.
+# 3. Remove the smaller cube in the middle of each face, and remove the smaller
+#    cube in the very center of the larger cube, leaving 20 smaller cubes. This
+#    is a level-1 Menger sponge (resembling a Void Cube).
+# 4. Repeat steps 2 and 3 for each of the remaining smaller cubes, and continue
+#    to iterate.
 
 import argparse
 
@@ -26,7 +22,8 @@ from math import ceil
 from matplotlib import pylab
 from mpl_toolkits.mplot3d import Axes3D
 
-from pypol import *
+from linpy import *
+
 
 x, y, z = symbols('x y z')
 
@@ -73,8 +70,8 @@ def menger(domain, count=1, cut=False):
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description='Compute a Menger sponge.')
-    parser.add_argument('-n', '--iterations', type=int, default=1,
-        help='number of iterations (default: 1)')
+    parser.add_argument('-n', '--iterations', type=int, default=2,
+        help='number of iterations (default: 2)')
     parser.add_argument('-c', '--cut', action='store_true', default=False,
         help='cut the sponge')
     args = parser.parse_args()
@@ -84,5 +81,3 @@ if __name__ == '__main__':
     plot = fig.add_subplot(1, 1, 1, projection='3d', aspect='equal')
     fractal.plot(plot)
     pylab.show()
-    
-# Copyright 2014 MINES ParisTech