Fix step-77: zero out residual before assembly

dealii · May 13, 2023 · ccad31a · ccad31a
1 parent 89a79f2
commit ccad31a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/examples/step-77/step-77.cc b/examples/step-77/step-77.cc
@@ -334,6 +334,8 @@ namespace Step77
 
     std::cout << "  Computing residual vector..." << std::flush;
 
+    residual = 0.0;
+
     const QGauss<dim> quadrature_formula(fe.degree + 1);
     FEValues<dim>     fe_values(fe,
                             quadrature_formula,