diff --git a/fastlib/trunk/contrib/dongryel/multigrid/multigrid_dev.h b/fastlib/trunk/contrib/dongryel/multigrid/multigrid_dev.h
index 9c61e62f1b..3e87936ba7 100644
--- a/fastlib/trunk/contrib/dongryel/multigrid/multigrid_dev.h
+++ b/fastlib/trunk/contrib/dongryel/multigrid/multigrid_dev.h
@@ -24,7 +24,7 @@ void Multigrid<MatrixType, VectorType>::Coarsen_(
   // previous level.
   const std::vector<int> &fine_point_indices = level_in.point_indices();
   std::vector<int> shuffle_indices(fine_point_indices.size());
-  for (int i = 0; i < shuffle_indices.size(); i++) {
+  for (unsigned int i = 0; i < shuffle_indices.size(); i++) {
     shuffle_indices[i] = i;
   }
   std::random_shuffle(shuffle_indices.begin(), shuffle_indices.end());
@@ -35,7 +35,7 @@ void Multigrid<MatrixType, VectorType>::Coarsen_(
   // point.
   std::vector< std::pair<int, int> > coarse_point_indices;
 
-  for (int i = 0; i < fine_point_indices.size(); i++) {
+  for (unsigned int i = 0; i < fine_point_indices.size(); i++) {
 
     // The index of the fine node point.
     int fine_point_index = shuffle_indices[i];
@@ -46,7 +46,7 @@ void Multigrid<MatrixType, VectorType>::Coarsen_(
     // Compute the sum of the affinities between the current fine node
     // point and the existing set of coarse points.
     double sum_coarse_affinities = 0;
-    for (int j = 0; j < coarse_point_indices.size(); j++) {
+    for (unsigned int j = 0; j < coarse_point_indices.size(); j++) {
 
       // The physical index of the coarse node point.
       int coarse_point_index = coarse_point_indices[j].first;
@@ -57,7 +57,7 @@ void Multigrid<MatrixType, VectorType>::Coarsen_(
     // Compute the sum of the affinities between the current fine node
     // and all of the points.
     double sum_all_affinities = 0;
-    for (int j = 0; j < fine_point_indices.size(); j++) {
+    for (unsigned int j = 0; j < fine_point_indices.size(); j++) {
       sum_all_affinities += level_in.get(fine_point_index, j);
     }
 
@@ -101,7 +101,7 @@ void Multigrid<MatrixType, VectorType>::Init(
 
     // The next level to be generated.
     MultigridLevel &next_level = levels_[ levels_.size() - 1 ];
-    Coarsen_(previous_level, &next_level);
+    Coarsen_(*previous_level, &next_level);
 
     // Change the previous level pointer.
     previous_level = &next_level;
diff --git a/fastlib/trunk/contrib/dongryel/multigrid/multigrid_test.cc b/fastlib/trunk/contrib/dongryel/multigrid/multigrid_test.cc
index ebb5f1d0a3..46d06c9ba9 100644
--- a/fastlib/trunk/contrib/dongryel/multigrid/multigrid_test.cc
+++ b/fastlib/trunk/contrib/dongryel/multigrid/multigrid_test.cc
@@ -19,6 +19,21 @@ class MultigridTest {
       int num_dimensions = math::RandInt(10, 70);
       left_hand_side_out->Init(num_dimensions, num_dimensions);
       right_hand_side_out->Init(num_dimensions);
+      
+      for(int j = 0; j < left_hand_side_out->n_cols(); j++) {
+	for(int i = 0; i < left_hand_side_out->n_rows(); i++) {
+	  if(i == j) {
+	    left_hand_side_out->set(i, j, 4.0);
+	  }
+	  else if(i == j + 1 || i + 1 == j) {
+	    left_hand_side_out->set(i, j, -1.0);
+	  }
+	  else {
+	    left_hand_side_out->set(i, j, 0.0);
+	  }
+	}
+	(*right_hand_side_out)[j] = math::Random(1.5, 4.0);
+      }
     }
 
   public:
@@ -30,6 +45,8 @@ class MultigridTest {
       Matrix left_hand_side;
       Vector right_hand_side;
       RandomSystem_(&left_hand_side, &right_hand_side);
+      
+      multigrid.Init(left_hand_side, right_hand_side, 1000);
     }
 
     void Start() {