Index: detail/vector_assign.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/numeric/ublas/detail/vector_assign.hpp,v
retrieving revision 1.7
diff -u -p -r1.7 vector_assign.hpp
--- detail/vector_assign.hpp	1 Jul 2005 20:09:01 -0000	1.7
+++ detail/vector_assign.hpp	12 Mar 2007 08:23:34 -0000
@@ -340,8 +341,9 @@ namespace detail {
             it += size;
         }
 #if BOOST_UBLAS_TYPE_CHECK
-        if (! disable_type_check<bool>::value)
-            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), external_logic ());
+        if (! disable_type_check<bool>::value) 
+            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), 
+                               external_logic ("external logic or bad condition of inputs"));
 #endif
     }
     // Sparse case
@@ -367,8 +369,9 @@ namespace detail {
             ++ ite;
         }
 #if BOOST_UBLAS_TYPE_CHECK
-        if (! disable_type_check<bool>::value)
-            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), external_logic ());
+        if (! disable_type_check<bool>::value) 
+            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), 
+                               external_logic ("external logic or bad condition of inputs"));
 #endif
     }
     // Sparse proxy or functional case
@@ -434,7 +437,8 @@ namespace detail {
         }
 #if BOOST_UBLAS_TYPE_CHECK
         if (! disable_type_check<bool>::value)
-            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), external_logic ());
+            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), 
+                               external_logic ("external logic or bad condition of inputs"));
 #endif
     }