1 files changed, 68 insertions, 0 deletions
diff --git a/eigen/test/prec_inverse_4x4.cpp b/eigen/test/prec_inverse_4x4.cpp
new file mode 100644
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+++ b/eigen/test/prec_inverse_4x4.cpp
@@ -0,0 +1,68 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include "main.h"
+#include <Eigen/LU>
+#include <algorithm>
+
+template<typename MatrixType> void inverse_permutation_4x4()
+{
+  typedef typename MatrixType::Scalar Scalar;
+  Vector4i indices(0,1,2,3);
+  for(int i = 0; i < 24; ++i)
+  {
+    MatrixType m = PermutationMatrix<4>(indices);
+    MatrixType inv = m.inverse();
+    double error = double( (m*inv-MatrixType::Identity()).norm() / NumTraits<Scalar>::epsilon() );
+    EIGEN_DEBUG_VAR(error)
+    VERIFY(error == 0.0);
+    std::next_permutation(indices.data(),indices.data()+4);
+  }
+}
+
+template<typename MatrixType> void inverse_general_4x4(int repeat)
+{
+  using std::abs;
+  typedef typename MatrixType::Scalar Scalar;
+  typedef typename MatrixType::RealScalar RealScalar;
+  double error_sum = 0., error_max = 0.;
+  for(int i = 0; i < repeat; ++i)
+  {
+    MatrixType m;
+    RealScalar absdet;
+    do {
+      m = MatrixType::Random();
+      absdet = abs(m.determinant());
+    } while(absdet < NumTraits<Scalar>::epsilon());
+    MatrixType inv = m.inverse();
+    double error = double( (m*inv-MatrixType::Identity()).norm() * absdet / NumTraits<Scalar>::epsilon() );
+    error_sum += error;
+    error_max = (std::max)(error_max, error);
+  }
+  std::cerr << "inverse_general_4x4, Scalar = " << type_name<Scalar>() << std::endl;
+  double error_avg = error_sum / repeat;
+  EIGEN_DEBUG_VAR(error_avg);
+  EIGEN_DEBUG_VAR(error_max);
+   // FIXME that 1.25 used to be a 1.0 until the NumTraits changes on 28 April 2010, what's going wrong??
+   // FIXME that 1.25 used to be 1.2 until we tested gcc 4.1 on 30 June 2010 and got 1.21.
+  VERIFY(error_avg < (NumTraits<Scalar>::IsComplex ? 8.0 : 1.25));
+  VERIFY(error_max < (NumTraits<Scalar>::IsComplex ? 64.0 : 20.0));
+}
+
+void test_prec_inverse_4x4()
+{
+  CALL_SUBTEST_1((inverse_permutation_4x4<Matrix4f>()));
+  CALL_SUBTEST_1(( inverse_general_4x4<Matrix4f>(200000 * g_repeat) ));
+
+  CALL_SUBTEST_2((inverse_permutation_4x4<Matrix<double,4,4,RowMajor> >()));
+  CALL_SUBTEST_2(( inverse_general_4x4<Matrix<double,4,4,RowMajor> >(200000 * g_repeat) ));
+
+  CALL_SUBTEST_3((inverse_permutation_4x4<Matrix4cf>()));
+  CALL_SUBTEST_3((inverse_general_4x4<Matrix4cf>(50000 * g_repeat)));
+}