diff -r be7dd3a8d6a3 -r 4764031c082c lemon/lp_base.h
--- a/lemon/lp_base.h	Fri Jan 20 19:20:02 2012 +0100
+++ b/lemon/lp_base.h	Sun May 06 16:52:11 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); }