diff options
author | Gael Guennebaud <g.gael@free.fr> | 2009-08-17 17:04:32 +0200 |
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committer | Gael Guennebaud <g.gael@free.fr> | 2009-08-17 17:04:32 +0200 |
commit | ff0f005d4c0bd46e88d050b9f147eab810f4814d (patch) | |
tree | 920149f278c900c38e2f09240e5eb37a7f6a6732 /test/householder.cpp | |
parent | e125c199bbe3c0b61c8732c7603b66745c4582fe (diff) |
change the make householder algorithm so that the remaining coefficient
is real, and make Tridiagonalization use it
Diffstat (limited to 'test/householder.cpp')
-rw-r--r-- | test/householder.cpp | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/test/householder.cpp b/test/householder.cpp index d8b11c9f1..7d300899f 100644 --- a/test/householder.cpp +++ b/test/householder.cpp @@ -27,6 +27,8 @@ template<typename MatrixType> void householder(const MatrixType& m) { + static bool even = true; + even = !even; /* this test covers the following files: Householder.h */ @@ -38,46 +40,55 @@ template<typename MatrixType> void householder(const MatrixType& m) typedef Matrix<Scalar, MatrixType::RowsAtCompileTime, 1> VectorType; typedef Matrix<Scalar, ei_decrement_size<MatrixType::RowsAtCompileTime>::ret, 1> EssentialVectorType; typedef Matrix<Scalar, MatrixType::RowsAtCompileTime, MatrixType::RowsAtCompileTime> SquareMatrixType; + + Matrix<Scalar, EIGEN_ENUM_MAX(MatrixType::RowsAtCompileTime,MatrixType::ColsAtCompileTime), 1> _tmp(std::max(rows,cols)); + Scalar* tmp = &_tmp.coeffRef(0,0); - RealScalar beta; + Scalar beta; + RealScalar alpha; EssentialVectorType essential; VectorType v1 = VectorType::Random(rows), v2; v2 = v1; - v1.makeHouseholder(&essential, &beta); - v1.applyHouseholderOnTheLeft(essential,beta); - + v1.makeHouseholder(&essential, &beta, &alpha); + v1.applyHouseholderOnTheLeft(essential,beta,tmp); VERIFY_IS_APPROX(v1.norm(), v2.norm()); VERIFY_IS_MUCH_SMALLER_THAN(v1.end(rows-1).norm(), v1.norm()); v1 = VectorType::Random(rows); v2 = v1; - v1.applyHouseholderOnTheLeft(essential,beta); + v1.applyHouseholderOnTheLeft(essential,beta,tmp); VERIFY_IS_APPROX(v1.norm(), v2.norm()); MatrixType m1(rows, cols), m2(rows, cols); v1 = VectorType::Random(rows); + if(even) v1.end(rows-1).setZero(); m1.colwise() = v1; m2 = m1; - m1.col(0).makeHouseholder(&essential, &beta); - m1.applyHouseholderOnTheLeft(essential,beta); + m1.col(0).makeHouseholder(&essential, &beta, &alpha); + m1.applyHouseholderOnTheLeft(essential,beta,tmp); VERIFY_IS_APPROX(m1.norm(), m2.norm()); VERIFY_IS_MUCH_SMALLER_THAN(m1.block(1,0,rows-1,cols).norm(), m1.norm()); + VERIFY_IS_MUCH_SMALLER_THAN(ei_imag(m1(0,0)), ei_real(m1(0,0))); + VERIFY_IS_APPROX(ei_real(m1(0,0)), alpha); v1 = VectorType::Random(rows); + if(even) v1.end(rows-1).setZero(); SquareMatrixType m3(rows,rows), m4(rows,rows); m3.rowwise() = v1.transpose(); m4 = m3; - m3.row(0).makeHouseholder(&essential, &beta); - m3.applyHouseholderOnTheRight(essential,beta); + m3.row(0).makeHouseholder(&essential, &beta, &alpha); + m3.applyHouseholderOnTheRight(essential,beta,tmp); VERIFY_IS_APPROX(m3.norm(), m4.norm()); VERIFY_IS_MUCH_SMALLER_THAN(m3.block(0,1,rows,rows-1).norm(), m3.norm()); + VERIFY_IS_MUCH_SMALLER_THAN(ei_imag(m3(0,0)), ei_real(m3(0,0))); + VERIFY_IS_APPROX(ei_real(m3(0,0)), alpha); } void test_householder() { - for(int i = 0; i < g_repeat; i++) { + for(int i = 0; i < 2*g_repeat; i++) { CALL_SUBTEST( householder(Matrix<double,2,2>()) ); CALL_SUBTEST( householder(Matrix<float,2,3>()) ); CALL_SUBTEST( householder(Matrix<double,3,5>()) ); |