From fbb18d03158ebddafbf7f20ab1ed2a3e6f60e720 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Mon, 30 Mar 2020 11:00:42 -0600
Subject: [PATCH] Output time and time step in step-26.

---
 examples/step-26/step-26.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/examples/step-26/step-26.cc b/examples/step-26/step-26.cc
index cc09e8e835..8c2f7ef4a3 100644
--- a/examples/step-26/step-26.cc
+++ b/examples/step-26/step-26.cc
@@ -291,7 +291,9 @@ namespace Step26
 
   // @sect4{<code>HeatEquation::output_results</code>}
   //
-  // Neither is there anything new in generating graphical output:
+  // Neither is there anything new in generating graphical output other than the
+  // fact that we tell the DataOut object what the current time and time step
+  // number is, so that this can be written into the output file:
   template <int dim>
   void HeatEquation<dim>::output_results() const
   {
@@ -302,6 +304,8 @@ namespace Step26
 
     data_out.build_patches();
 
+    data_out.set_flags(DataOutBase::VtkFlags(time, timestep_number));
+
     const std::string filename =
       "solution-" + Utilities::int_to_string(timestep_number, 3) + ".vtk";
     std::ofstream output(filename);
-- 
2.39.5