diff -r 371cf309fc3c -r 26983135fd6d lemon/lp_base.h
--- a/lemon/lp_base.h	Wed Nov 14 17:44:42 2007 +0000
+++ b/lemon/lp_base.h	Wed Nov 14 17:53:08 2007 +0000
@@ -1369,9 +1369,27 @@
 
     ///\e
     Value primal(Col c) const { return _getPrimal(_lpId(c)); }
+    ///\e
+    Value primal(const Expr& e) const {
+      double res = e.constComp();
+      for (std::map<Col, double>::const_iterator it = e.begin();
+	   it != e.end(); ++it) {
+	res += _getPrimal(_lpId(it->first)) * it->second;
+      }
+      return res; 
+    }
 
     ///\e
     Value dual(Row r) const { return _getDual(_lpId(r)); }
+    ///\e
+    Value dual(const DualExpr& e) const {
+      double res = 0.0;
+      for (std::map<Row, double>::const_iterator it = e.begin();
+	   it != e.end(); ++it) {
+	res += _getPrimal(_lpId(it->first)) * it->second;
+      }
+      return res; 
+    }
 
     ///\e
     bool isBasicCol(Col c) const { return _isBasicCol(_lpId(c)); }