In operator = function we need to compress before we call MatZeroEntries.

git-svn-id: https://svn.dealii.org/trunk@9302 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/lac/source/petsc_matrix_base.cc b/deal.II/lac/source/petsc_matrix_base.cc
index 6f6ae79eb47667d1d6db8454caa979c0ebfcccef..2de5b4a5ace5c6b4d050f4574cbbc6090fab984d 100644 (file)
--- a/deal.II/lac/source/petsc_matrix_base.cc
+++ b/deal.II/lac/source/petsc_matrix_base.cc
@@ -101,7 +101,11 @@ namespace PETScWrappers
   MatrixBase &
   MatrixBase::operator = (const double d)
   {
-    Assert (d==0, ExcScalarAssignmentOnlyForZeroValue());    
+    Assert (d==0, ExcScalarAssignmentOnlyForZeroValue());
+                                    // first flush the buffers as
+                                    // this is not done by
+                                    // MatZeroEntries
+    compress();
     
     const int ierr = MatZeroEntries (matrix);
     AssertThrow (ierr == 0, ExcPETScError(ierr));