From 42731600ed1d1efb37b81471437d46af52eee145 Mon Sep 17 00:00:00 2001
From: Christoph Ruegg <git@cdrnet.ch>
Date: Sat, 20 Jul 2013 18:52:07 +0200
Subject: [PATCH] RootFinding: OfFunctionAndDerivative fall back to Bisection
 instead of Brent (more robust)

---
 src/Numerics/FindRoots.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Numerics/FindRoots.cs b/src/Numerics/FindRoots.cs
index deef6948..1dd1a80d 100644
--- a/src/Numerics/FindRoots.cs
+++ b/src/Numerics/FindRoots.cs
@@ -38,6 +38,7 @@ namespace MathNet.Numerics
         public static double OfFunction(Func<double, double> f, double lowerBound, double upperBound, double accuracy = 1e-8)
         {
             double root;
+
             if (Brent.TryFindRoot(f, lowerBound, upperBound, accuracy, 100, out root))
             {
                 return root;
@@ -54,11 +55,13 @@ namespace MathNet.Numerics
         public static double OfFunctionAndDerivative(Func<double, double> f, Func<double, double> df, double lowerBound, double upperBound, double accuracy = 1e-8)
         {
             double root;
+
             if (RobustNewtonRaphson.TryFindRoot(f, df, lowerBound, upperBound, accuracy, 100, 20, out root))
             {
                 return root;
             }
-            if (Brent.TryFindRoot(f, lowerBound, upperBound, accuracy, 100, out root))
+
+            if (Bisection.TryFindRoot(f, lowerBound, upperBound, accuracy, 100, out root))
             {
                 return root;
             }