--- /dev/null
+//---------------------------- vector_21_negative.cc ---------------------------
+// $Id$
+// Version: $Name$
+//
+// Copyright (C) 2004, 2005, 2007 by the deal.II authors
+//
+// This file is subject to QPL and may not be distributed
+// without copyright and license information. Please refer
+// to the file deal.II/doc/license.html for the text and
+// further information on this license.
+//
+//---------------------------- vector_21_negative.cc ---------------------------
+
+
+// check Vector<double>::operator /=. the original check was that the factor
+// by which we divide must be positive. this is of course nonsensical, it
+// should have been that the factor is != 0...
+
+#include "../tests.h"
+#include <lac/vector.h>
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+
+void test (Vector<double> &v)
+{
+ // set only certain elements of the
+ // vector. have a bit pattern of where we
+ // actually wrote elements to
+ std::vector<bool> pattern (v.size(), false);
+ for (unsigned int i=0; i<v.size(); i+=1+i)
+ {
+ v(i) = i;
+ pattern[i] = true;
+ }
+ v.compress ();
+
+ // multiply v with 3/4
+ v /= -4./3.;
+
+ // check that the entries are ok
+ for (unsigned int i=0; i<v.size(); ++i)
+ Assert (((pattern[i] == true) && (v(i)-(-3.*i/4.) == 0))
+ ||
+ ((pattern[i] == false) && (v(i) == 0)),
+ ExcInternalError());
+
+ deallog << "OK" << std::endl;
+}
+
+
+
+int main ()
+{
+ std::ofstream logfile("vector_21_negative/output");
+ deallog.attach(logfile);
+ deallog.depth_console(0);
+ deallog.threshold_double(1.e-10);
+
+ try
+ {
+ Vector<double> v (100);
+ test (v);
+ }
+ catch (std::exception &exc)
+ {
+ std::cerr << std::endl << std::endl
+ << "----------------------------------------------------"
+ << std::endl;
+ std::cerr << "Exception on processing: " << std::endl
+ << exc.what() << std::endl
+ << "Aborting!" << std::endl
+ << "----------------------------------------------------"
+ << std::endl;
+
+ return 1;
+ }
+ catch (...)
+ {
+ std::cerr << std::endl << std::endl
+ << "----------------------------------------------------"
+ << std::endl;
+ std::cerr << "Unknown exception!" << std::endl
+ << "Aborting!" << std::endl
+ << "----------------------------------------------------"
+ << std::endl;
+ return 1;
+ };
+}