Changeset 1326:85f1c483279e in lemon-0.x

Timestamp:

04/08/05 16:40:37 (20 years ago)

Author:

Alpar Juttner

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@1765

Message:

Add presolver() to turn on/off the GLPK presolver

Location:

src

Files:

• demo/lp_demo.cc (modified) (2 diffs)
• lemon/lp_glpk.cc (modified) (1 diff)
• lemon/lp_glpk.h (modified) (3 diffs)

src/demo/lp_demo.cc

@@ -39 +39 @@
   }
   lp.max();
+
+  lp.presolver(true);
+  
+  lp.messageLevel(3);
+
   lp.solve();
 
@@ -46 +51 @@
 int main() 
 {
-  LpGlpk lp_glpk;
-
   ListGraph g;
   ListGraph::Node s;
   ListGraph::Node t;
   
-
   ListGraph::EdgeMap<double> cap(g);
   

src/lemon/lp_glpk.cc

@@ -314 +314 @@
   }
 
+  void LpGlpk::presolver(bool b)
+  {
+    lpx_set_int_parm(lp, LPX_K_PRESOL, b);
+  }
+
  
 } //END OF NAMESPACE LEMON

src/lemon/lp_glpk.h

@@ -23 +23 @@
 #include "lp_base.h"
 extern "C" {
-#include "glpk.h"
+#include <glpk.h>
 }
 
@@ -77 +77 @@
     ///Set the verbosity of the messages
 
+    ///Set the verbosity of the messages
+    ///
     ///\param m is the level of the messages output by the solver routines.
     ///The possible values are:
@@ -84 +86 @@
     ///- 3 --- full output (includes informational messages)
     void messageLevel(int m);
+    ///Turns on or off the presolver
+
+    ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver
+    ///
+    ///The presolver is off by default.
+    void presolver(bool b);
     
   };