diff -r 8e85e6bbefdf -r e0beb94d08bf lemon/lp_base.h
--- a/lemon/lp_base.h	Mon May 23 04:48:14 2005 +0000
+++ b/lemon/lp_base.h	Thu May 26 12:16:16 2005 +0000
@@ -417,7 +417,14 @@
 
     //Abstract virtual functions
     virtual LpSolverBase &_newLp() = 0;
-    virtual LpSolverBase &_copyLp() = 0;
+    virtual LpSolverBase &_copyLp(){
+      ///\todo This should be implemented here, too,  when we have problem retrieving routines. It can be overriden.
+
+      //Starting:
+      LpSolverBase & newlp(_newLp());
+      return newlp;
+      //return *(LpSolverBase*)0;
+    };
 
     virtual int _addCol() = 0;
     virtual int _addRow() = 0;
@@ -608,6 +615,15 @@
       return r;
     }
 
+    ///Set an element of the coefficient matrix of the LP
+
+    ///\param r is the row of the element to be modified
+    ///\param c is the coloumn of the element to be modified
+    ///\param val is the new value of the coefficient
+    void setCoeff(Row r, Col c, Value val){
+      _setCoeff(rows.floatingId(r.id),cols.floatingId(c.id), val);
+    }
+
     /// Set the lower bound of a column (i.e a variable)
 
     /// The upper bound of a variable (column) has to be given by an