From 70f355b51a8e98d999711e6458034603dea1cf5a Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 22 Jul 2010 21:26:09 +0200
Subject: [PATCH] backport fix on 3x3 triadiagonalization, this fix #149

---
 Eigen/src/QR/Tridiagonalization.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Eigen/src/QR/Tridiagonalization.h b/Eigen/src/QR/Tridiagonalization.h
index 69b395fe9..398535ba1 100644
--- a/Eigen/src/QR/Tridiagonalization.h
+++ b/Eigen/src/QR/Tridiagonalization.h
@@ -391,7 +391,7 @@ void Tridiagonalization<MatrixType>::_decomposeInPlace3x3(MatrixType& mat, Diago
 {
   diag[0] = ei_real(mat(0,0));
   RealScalar v1norm2 = ei_abs2(mat(0,2));
-  if (ei_isMuchSmallerThan(v1norm2, RealScalar(1)))
+  if (v1norm2==RealScalar(0))
   {
     diag[1] = ei_real(mat(1,1));
     diag[2] = ei_real(mat(2,2));