initialize sizes

diff --git a/source/lac/petsc_parallel_block_sparse_matrix.cc b/source/lac/petsc_parallel_block_sparse_matrix.cc
index fe4c291c058cac30bbcb0335c4b8b43a2f83acfc..f75fb5513d7074ebd93f2e4ba50d7df92dd6767c 100644 (file)
--- a/source/lac/petsc_parallel_block_sparse_matrix.cc
+++ b/source/lac/petsc_parallel_block_sparse_matrix.cc
@@ -166,10 +166,10 @@ namespace PETScWrappers
       // Create empty matrices if needed
       // This is neeeded by the base class
       // not by MATNEST
-      std::vector<size_type> row_sizes(m);
-      std::vector<size_type> col_sizes(n);
-      std::vector<size_type> row_local_sizes(m);
-      std::vector<size_type> col_local_sizes(n);
+      std::vector<size_type> row_sizes(m, size_type(-1));
+      std::vector<size_type> col_sizes(n, size_type(-1));
+      std::vector<size_type> row_local_sizes(m, size_type(-1));
+      std::vector<size_type> col_local_sizes(n, size_type(-1));
       MPI_Comm               comm = MPI_COMM_NULL;
       for (size_type r = 0; r < m; r++)
         {