* 4x4 inverse: revert to cofactors method

* inverse tests: use createRandomMatrixOfRank, use more strict precision
* tests: createRandomMatrixOfRank: support 1x1 matrices
* determinant: nest the xpr
* Minor: add comment

1 files changed, 2 insertions, 9 deletions

diff --git a/test/inverse.cpp b/test/inverse.cpp
index 59b791507..b80e139e0 100644
--- a/test/inverse.cpp
+++ b/test/inverse.cpp
@@ -38,18 +38,11 @@ template<typename MatrixType> void inverse(const MatrixType& m)
   typedef typename NumTraits<Scalar>::Real RealScalar;
   typedef Matrix<Scalar, MatrixType::ColsAtCompileTime, 1> VectorType;
 
-  MatrixType m1 = MatrixType::Random(rows, cols),
+  MatrixType m1(rows, cols),
              m2(rows, cols),
              mzero = MatrixType::Zero(rows, cols),
              identity = MatrixType::Identity(rows, rows);
-
-  if (ei_is_same_type<RealScalar,float>::ret)
-  {
-    // let's build a more stable to inverse matrix
-    MatrixType a = MatrixType::Random(rows,cols);
-    m1 += m1 * m1.adjoint() + a * a.adjoint();
-  }
-
+  createRandomMatrixOfRank(rows,rows,rows,m1);
   m2 = m1.inverse();
   VERIFY_IS_APPROX(m1, m2.inverse() );