From a370b1f2e20804f0b99bcda1c3940f00300e4f90 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Fri, 17 Oct 2014 16:52:56 +0200
Subject: Fix SparseLU::absDeterminant and add respective unit test

---
 test/sparse_solver.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'test/sparse_solver.h')

diff --git a/test/sparse_solver.h b/test/sparse_solver.h
index 8c8d7f939..b10eaebcc 100644
--- a/test/sparse_solver.h
+++ b/test/sparse_solver.h
@@ -133,7 +133,23 @@ void check_sparse_determinant(Solver& solver, const typename Solver::MatrixType&
   Scalar refDet = dA.determinant();
   VERIFY_IS_APPROX(refDet,solver.determinant());
 }
+template<typename Solver, typename DenseMat>
+void check_sparse_abs_determinant(Solver& solver, const typename Solver::MatrixType& A, const DenseMat& dA)
+{
+  using std::abs;
+  typedef typename Solver::MatrixType Mat;
+  typedef typename Mat::Scalar Scalar;
+  
+  solver.compute(A);
+  if (solver.info() != Success)
+  {
+    std::cerr << "sparse solver testing: factorization failed (check_sparse_abs_determinant)\n";
+    return;
+  }
 
+  Scalar refDet = abs(dA.determinant());
+  VERIFY_IS_APPROX(refDet,solver.absDeterminant());
+}
 
 template<typename Solver, typename DenseMat>
 int generate_sparse_spd_problem(Solver& , typename Solver::MatrixType& A, typename Solver::MatrixType& halfA, DenseMat& dA, int maxSize = 300)
@@ -333,3 +349,20 @@ template<typename Solver> void check_sparse_square_determinant(Solver& solver)
     check_sparse_determinant(solver, A, dA);
   }
 }
+
+template<typename Solver> void check_sparse_square_abs_determinant(Solver& solver)
+{
+  typedef typename Solver::MatrixType Mat;
+  typedef typename Mat::Scalar Scalar;
+  typedef Matrix<Scalar,Dynamic,Dynamic> DenseMatrix;
+
+  // generate the problem
+  Mat A;
+  DenseMatrix dA;
+  generate_sparse_square_problem(solver, A, dA, 30);
+  A.makeCompressed();
+  for (int i = 0; i < g_repeat; i++) {
+    check_sparse_abs_determinant(solver, A, dA);
+  }
+}
+
-- 
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