From 8ca71f833d1972af605b8d1684e449538758ef26 Mon Sep 17 00:00:00 2001
From: Richard Roberts <richard.jw.roberts@gmail.com>
Date: Mon, 26 Nov 2012 19:21:07 +0000
Subject: [PATCH] Fix in VectorValues::hasSameStructure

---
 gtsam/linear/VectorValues.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gtsam/linear/VectorValues.cpp b/gtsam/linear/VectorValues.cpp
index 219f2e5f5..efe642d93 100644
--- a/gtsam/linear/VectorValues.cpp
+++ b/gtsam/linear/VectorValues.cpp
@@ -148,7 +148,8 @@ bool VectorValues::hasSameStructure(const VectorValues& other) const {
   if(this->size() != other.size())
     return false;
   for(size_t j=0; j<size(); ++j)
-    if(this->dim(j) != other.dim(j))
+    // Directly accessing maps instead of using VV::dim in case some values are empty
+    if(this->maps_[j].rows() != other.maps_[j].rows())
       return false;
   return true;
 }