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Fix D&C SVD wrt zero matrices

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This commit is contained in:
Gael Guennebaud 2014-10-17 15:32:55 +02:00
parent feacfa5f83
commit 4b7c3abbea
1 changed files with 9 additions and 21 deletions
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30
unsupported/Eigen/src/BDCSVD/BDCSVD.h
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@ -194,7 +194,7 @@ public:
}; //end class BDCSVD
// Methode to allocate ans initialize matrix and attributes
// Method to allocate and initialize matrix and attributes
template<typename MatrixType>
void BDCSVD<MatrixType>::allocate(Index rows, Index cols, unsigned int computationOptions)
{
@ -215,24 +215,6 @@ void BDCSVD<MatrixType>::allocate(Index rows, Index cols, unsigned int computati
if (m_compV) m_naiveV = MatrixXr::Zero(m_diagSize, m_diagSize);
}// end allocate
// Methode which compute the BDCSVD for the int
template<>
BDCSVD<Matrix<int, Dynamic, Dynamic> >& BDCSVD<Matrix<int, Dynamic, Dynamic> >::compute(const MatrixType& matrix, unsigned int computationOptions)
{
allocate(matrix.rows(), matrix.cols(), computationOptions);
m_nonzeroSingularValues = 0;
m_computed = Matrix<int, Dynamic, Dynamic>::Zero(rows(), cols());
m_singularValues.head(m_diagSize).setZero();
if (m_computeFullU) m_matrixU.setZero(rows(), rows());
if (m_computeFullV) m_matrixV.setZero(cols(), cols());
m_isInitialized = true;
return *this;
}
// Methode which compute the BDCSVD
template<typename MatrixType>
BDCSVD<MatrixType>& BDCSVD<MatrixType>::compute(const MatrixType& matrix, unsigned int computationOptions)
{
@ -612,6 +594,8 @@ void BDCSVD<MatrixType>::computeSVDofM(Index firstCol, Index n, MatrixXr& U, Vec
#endif
#ifdef EIGEN_BDCSVD_SANITY_CHECKS
assert(U.allFinite());
assert(V.allFinite());
assert((U.transpose() * U - MatrixXr(MatrixXr::Identity(U.cols(),U.cols()))).norm() < 1e-14 * n);
assert((V.transpose() * V - MatrixXr(MatrixXr::Identity(V.cols(),V.cols()))).norm() < 1e-14 * n);
assert(m_naiveU.allFinite());
@ -836,8 +820,12 @@ void BDCSVD<MatrixType>::perturbCol0
using std::sqrt;
Index n = col0.size();
Index m = perm.size();
Index last = perm(m-1);
if(m==0)
{
zhat.setZero();
return;
}
Index last = last = perm(m-1);
// The offset permits to skip deflated entries while computing zhat
for (Index k = 0; k < n; ++k)
{