diff -r 305ce06287c9 -r 0219ee65ffcc lemon/lp_base.h
--- a/lemon/lp_base.h	Thu Jul 07 09:04:39 2005 +0000
+++ b/lemon/lp_base.h	Thu Jul 07 15:00:04 2005 +0000
@@ -138,19 +138,19 @@
       INFINITE = 4
     };
 
-      ///\e The type of the investigated LP problem
-      enum ProblemTypes {
-	  ///Primal-dual feasible
-	  PRIMAL_DUAL_FEASIBLE = 0,
-	  ///Primal feasible dual infeasible
-	  PRIMAL_FEASIBLE_DUAL_INFEASIBLE = 1,
-	  ///Primal infeasible dual feasible
-	  PRIMAL_INFEASIBLE_DUAL_FEASIBLE = 2,
-	  ///Primal-dual infeasible
-	  PRIMAL_DUAL_INFEASIBLE = 3,
-	  ///Could not determine so far
-	  UNKNOWN = 4
-      };
+    ///\e The type of the investigated LP problem
+    enum ProblemTypes {
+      ///Primal-dual feasible
+      PRIMAL_DUAL_FEASIBLE = 0,
+      ///Primal feasible dual infeasible
+      PRIMAL_FEASIBLE_DUAL_INFEASIBLE = 1,
+      ///Primal infeasible dual feasible
+      PRIMAL_INFEASIBLE_DUAL_FEASIBLE = 2,
+      ///Primal-dual infeasible
+      PRIMAL_DUAL_INFEASIBLE = 3,
+      ///Could not determine so far
+      UNKNOWN = 4
+    };
 
     ///The floating point type used by the solver
     typedef double Value;
@@ -552,6 +552,8 @@
 
     virtual int _addCol() = 0;
     virtual int _addRow() = 0;
+    virtual void _eraseCol(int col) = 0;
+    virtual void _eraseRow(int row) = 0;
     virtual void _setRowCoeffs(int i, 
 			       int length,
                                int  const * indices, 
@@ -680,7 +682,7 @@
 
     ///\param c is the column to be modified
     ///\param e is a dual linear expression (see \ref DualExpr)
-    ///\bug This is a temportary function. The interface will change to
+    ///\bug This is a temporary function. The interface will change to
     ///a better one.
     void setCol(Col c,const DualExpr &e) {
       std::vector<int> indices;
@@ -717,8 +719,8 @@
     ///\return The created row
     Row addRow() { Row r; r.id=rows.insert(_addRow()); return r;}
 
-    ///\brief Adds several new row
-    ///(i.e a variables) at once
+    ///\brief Add several new rows
+    ///(i.e a constraints) at once
     ///
     ///This magic function takes a container as its argument
     ///and fills its elements
@@ -843,6 +845,22 @@
       setRow(r,c);
       return r;
     }
+    ///Erase a coloumn (i.e a variable) from the LP
+
+    ///\param c is the coloumn to be deleted
+    ///\todo Please check this
+    void eraseCol(Col c) {
+      _eraseCol(cols.floatingId(c.id));
+      cols.erase(c.id);
+    }
+    ///Erase a  row (i.e a constraint) from the LP
+
+    ///\param r is the row to be deleted
+    ///\todo Please check this
+    void eraseRow(Row r) {
+      _eraseRow(rows.floatingId(r.id));
+      rows.erase(r.id);
+    }
 
     ///Set an element of the coefficient matrix of the LP