From 3d751af128223c3d60ecec67e25501956f629667 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Sun, 4 Apr 2004 23:31:00 +0000
Subject: [PATCH] Fix some things. Mesh refinement now also parallel.

git-svn-id: https://svn.dealii.org/trunk@8962 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/examples/step-17/step-17.cc | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/deal.II/examples/step-17/step-17.cc b/deal.II/examples/step-17/step-17.cc
index 8171dc531b..1e9007538b 100644
--- a/deal.II/examples/step-17/step-17.cc
+++ b/deal.II/examples/step-17/step-17.cc
@@ -410,15 +410,40 @@ void ElasticProblem<dim>::refine_grid ()
                                    // XXX
   {
     PETScWrappers::Vector localized_solution (solution);
+    Vector<float> local_error_per_cell (triangulation.n_active_cells());
     
     typename FunctionMap<dim>::type neumann_boundary;
     KellyErrorEstimator<dim>::estimate (dof_handler,
                                         QGauss2<dim-1>(),
                                         neumann_boundary,
                                         localized_solution,
-                                        estimated_error_per_cell);
+                                        local_error_per_cell,
+                                        std::vector<bool>(),
+                                        0,
+                                        multithread_info.n_default_threads,
+                                        this_partition);
+    
+    const unsigned int local_cells
+      = (n_partitions == 1 ?
+         triangulation.n_active_cells() :
+         (this_partition != n_partitions-1 ?
+          triangulation.n_active_cells() / n_partitions :
+          triangulation.n_active_cells() - triangulation.n_active_cells() / n_partitions * (n_partitions-1)));
+    PETScWrappers::MPI::Vector
+      global_error_per_cell (mpi_communicator,
+                             triangulation.n_active_cells(),
+                             local_cells);
+
+
+    for (unsigned int i=0; i<local_error_per_cell.size(); ++i)
+      if (local_error_per_cell(i) != 0)
+        global_error_per_cell(i) = local_error_per_cell(i);
+    global_error_per_cell.compress ();
+
+    estimated_error_per_cell = global_error_per_cell;
   }
 
+  
   GridRefinement::refine_and_coarsen_fixed_number (triangulation,
 						   estimated_error_per_cell,
 						   0.3, 0.03);
-- 
2.39.5