diff -r 4bb9e72e1a41 -r 7fdaa05a69a1 lemon/lp_base.h
--- a/lemon/lp_base.h	Wed Sep 12 17:25:48 2012 +0200
+++ b/lemon/lp_base.h	Thu Sep 13 11:56:19 2012 +0200
@@ -1556,7 +1556,7 @@
     void min() { _setSense(MIN); }
 
     ///Clears the problem
-    void clear() { _clear(); }
+    void clear() { _clear(); rows.clear(); cols.clear(); }
 
     /// Sets the message level of the solver
     void messageLevel(MessageLevel level) { _messageLevel(level); }