--- /dev/null
+//----------------------------------------------------------------------
+// $Id: umfpack_03.cc 13855 2006-09-08 14:42:11Z heltai $
+// Version: $Name$
+//
+// Copyright (C) 2002, 2003, 2004, 2005, 2006 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.
+//
+//----------------------------------------------------------------------
+
+// test the umfpack sparse direct solver on a simple 2x2 block matrix
+// that equals the unit matrix. same as umfpack_05, but with the
+// difference that there, the matrix is partitioned into 2+2 rows and
+// columns. here, do it as 3+1
+
+#include "../tests.h"
+#include <iostream>
+#include <fstream>
+#include <cstdlib>
+
+#include <lac/block_sparse_matrix.h>
+#include <lac/block_sparsity_pattern.h>
+#include <lac/vector.h>
+#include <lac/sparse_direct.h>
+
+
+void test ()
+{
+ std::vector<unsigned int> size (2);
+ size[0] = 3;
+ size[1] = 1;
+
+ BlockSparsityPattern b_sparsity_pattern;
+ b_sparsity_pattern.reinit(size.size(),size.size());
+ for (unsigned int k=0; k<size.size();++k)
+ for (unsigned int l=0; l<size.size();++l)
+ b_sparsity_pattern.block(k,l).reinit(size[k],
+ size[l],
+ 3);
+ b_sparsity_pattern.collect_sizes();
+ for (unsigned int i=0; i<4; ++i)
+ for (unsigned int j=0; j<4; ++j)
+ b_sparsity_pattern.add (i,j);
+ b_sparsity_pattern.compress();
+
+ BlockSparseMatrix<double> Bb (b_sparsity_pattern);
+ for (unsigned int i=0; i<4; ++i)
+ Bb.add (i,i,1);
+
+ SparseDirectUMFPACK umfpackb;
+ umfpackb.factorize(Bb);
+
+ Vector<double> ubb(4);
+ for (unsigned int i=0; i<4; ++i)
+ ubb(i) = i;
+
+ umfpackb.solve(ubb);
+
+ for (unsigned int i=0; i<4; ++i)
+ Assert (std::fabs (ubb(i) - i) < 1e-12,
+ ExcInternalError());
+
+ deallog << "OK" << std::endl;
+}
+
+
+int main ()
+{
+ std::ofstream logfile("umfpack_06/output");
+ deallog.attach(logfile);
+ deallog.depth_console(0);
+ deallog.threshold_double(1.e-10);
+
+ test ();
+}