From: Martin Kronbichler <martin.kronbichler@it.uu.se>
Date: Wed, 23 Feb 2022 16:03:37 +0000 (+0100)
Subject: Fix run time error in step-75.
X-Git-Tag: v9.4.0-rc1~447^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=72ecab76702b12e42b1306f8bb0cbcf300db5213;p=dealii.git

Fix run time error in step-75.
---

diff --git a/examples/step-75/step-75.cc b/examples/step-75/step-75.cc
index 744e5ab710..5487456221 100644
--- a/examples/step-75/step-75.cc
+++ b/examples/step-75/step-75.cc
@@ -427,6 +427,7 @@ namespace Step75
   void LaplaceOperator<dim, number>::compute_inverse_diagonal(
     VectorType &diagonal) const
   {
+    this->matrix_free.initialize_dof_vector(diagonal);
     MatrixFreeTools::compute_diagonal(matrix_free,
                                       diagonal,
                                       &LaplaceOperator::do_cell_integral_local,