From cfb76b242f9c0ab8c471d825a772ed0e30782ac0 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 26 Jul 2012 18:04:58 +0200
Subject: [PATCH] RealSchur: improve speed of computeNormOfT

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

diff --git a/Eigen/src/Eigenvalues/RealSchur.h b/Eigen/src/Eigenvalues/RealSchur.h
index da877dd04..4cdfb17c2 100644
--- a/Eigen/src/Eigenvalues/RealSchur.h
+++ b/Eigen/src/Eigenvalues/RealSchur.h
@@ -300,7 +300,7 @@ inline typename MatrixType::Scalar RealSchur<MatrixType>::computeNormOfT()
   //               + m_matT.bottomLeftCorner(size-1,size-1).diagonal().cwiseAbs().sum();
   Scalar norm(0);
   for (Index j = 0; j < size; ++j)
-    norm += m_matT.row(j).segment((std::max)(j-1,Index(0)), size-(std::max)(j-1,Index(0))).cwiseAbs().sum();
+    norm += m_matT.col(j).segment(0, (std::min)(size,j+2)).cwiseAbs().sum();
   return norm;
 }