From 2a0d532e5965402f19f74f70dfdcc7efd1055b15 Mon Sep 17 00:00:00 2001
From: Tim Blechmann <timblech@users.sourceforge.net>
Date: Sat, 1 Jan 2005 11:06:58 +0000
Subject: speedup using function pointers

svn path=/trunk/externals/tb/; revision=2439
---
 chaos/src/logistic_map.hpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

(limited to 'chaos/src/logistic_map.hpp')

diff --git a/chaos/src/logistic_map.hpp b/chaos/src/logistic_map.hpp
index 1808baa..ef2f603 100644
--- a/chaos/src/logistic_map.hpp
+++ b/chaos/src/logistic_map.hpp
@@ -21,7 +21,7 @@
 #include "map_base.hpp"
 
 //  logistic map: x[n+1] = alpha * x[n] * (1 - x[n])
-//                0 <= x[n]  <  1
+//                0 < x[n] <  1
 //                0 <= alpha <= 4
 
 class logistic:
@@ -43,9 +43,9 @@ public:
 
 	virtual void m_step()
 	{
-		data_t data = m_data[0];
+		data_t x = m_data[0];
 		data_t alpha = CHAOS_PARAMETER(alpha);
-		m_data[0] = alpha * data * (1.f - data);
+		m_data[0] = alpha * x * (1.f - x);
 	}
 
 	CHAOS_SYSPAR_FUNCS_PRED(alpha, m_pred_alpha);
@@ -60,6 +60,14 @@ public:
 	{
 		return (f > 0) && (f < 1);
 	}
+
+	virtual void m_verify()
+	{
+		data_t x = m_data[0];
+		if (m_pred_x(x))
+			return;
+		m_data[0] = 0.5;
+	}
 };
 
 #define LOGISTIC_CALLBACKS						\
-- 
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