Merge pull request #16742 from peterrum/relaxation_omega

PreconditionRelaxation: automatically determine omega
dealii · Mar 13, 2024 · f20f8d3 · f20f8d3
2 parents 43a7737 + f4f94e2
commit f20f8d3
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diff --git a/doc/news/changes/minor/20240209Munch b/doc/news/changes/minor/20240209Munch
@@ -0,0 +1,6 @@
+New: If the relaxation parameter is set to 0, 
+PreconditionRelaxation now determines it based on
+estimated eigenvalues, similarly as PreconditionChebyshev
+does.
+<br>
+(Peter Munch, Laura Prieto Saavedra, 2024/03/09)
diff --git a/include/deal.II/lac/affine_constraints.h b/include/deal.II/lac/affine_constraints.h
@@ -2756,7 +2756,7 @@ AffineConstraints<number>::copy_from(
   lines.clear();
   lines.reserve(other.lines.size());
 
-  for (const auto l : other.lines)
+  for (const auto &l : other.lines)
     lines.emplace_back(l.index,
                        typename ConstraintLine::Entries(l.entries.begin(),
                                                         l.entries.end()),