Data commit

Task/Percolation-Mean-run-density/Python/percolation-mean-run-density.py

@@ -0,0 +1,24 @@
+from __future__ import division
+from random import random
+from math import fsum
+
+n, p, t = 100, 0.5, 500
+
+def newv(n, p):
+    return [int(random() < p) for i in range(n)]
+
+def runs(v):
+    return sum((a & ~b) for a, b in zip(v, v[1:] + [0]))
+
+def mean_run_density(n, p):
+    return runs(newv(n, p)) / n
+
+for p10 in range(1, 10, 2):
+    p = p10 / 10
+    limit = p * (1 - p)
+    print('')
+    for n2 in range(10, 16, 2):
+        n = 2**n2
+        sim = fsum(mean_run_density(n, p) for i in range(t)) / t
+        print('t=%3i p=%4.2f n=%5i p(1-p)=%5.3f sim=%5.3f delta=%3.1f%%'
+              % (t, p, n, limit, sim, abs(sim - limit) / limit * 100 if limit else sim * 100))