From 14208eb47840d8c1fb5b2fab09f23fb575acca6f Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Fri, 3 Dec 2010 10:54:16 +0100
Subject: [PATCH] add a word about the ei_ prefix change in Eigen2 -> Eigen3
 doc page.

---
 doc/A05_PortingFrom2To3.dox | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/A05_PortingFrom2To3.dox b/doc/A05_PortingFrom2To3.dox
index 3cfae061e..13f610a5b 100644
--- a/doc/A05_PortingFrom2To3.dox
+++ b/doc/A05_PortingFrom2To3.dox
@@ -278,6 +278,12 @@ There also are related convenience static methods:
 result = Vector4f::MapAligned(some_aligned_array);
 \endcode
 
+\section eiPrefix Internal ei_ prefix
+
+In Eigen2, global internal functions and structures were prefixed by \c ei_. In Eigen3, they all have been moved into the more explicit \c internal namespace. So, e.g., \c ei_sqrt(x) now becomes \c internal::sqrt(x).
+
+
+
 */
 
 }