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fix bug #478: RealSchur failed on a zero matrix.

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(transplanted from b96b429aa2
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This commit is contained in:
Gael Guennebaud
2012-06-20 10:08:32 +02:00
parent 45e1bb5ea5
commit a1a0cccd4e
1 changed files with 33 additions and 30 deletions
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3
Eigen/src/Eigenvalues/RealSchur.h
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@@ -238,6 +238,8 @@ RealSchur<MatrixType>& RealSchur<MatrixType>::compute(const MatrixType& matrix,
Scalar exshift = 0.0; // sum of exceptional shifts Scalar exshift = 0.0; // sum of exceptional shifts
Scalar norm = computeNormOfT(); Scalar norm = computeNormOfT();
if(norm!=0)
{
while (iu >= 0) while (iu >= 0)
{ {
Index il = findSmallSubdiagEntry(iu, norm); Index il = findSmallSubdiagEntry(iu, norm);
@@ -269,6 +271,7 @@ RealSchur<MatrixType>& RealSchur<MatrixType>::compute(const MatrixType& matrix,
performFrancisQRStep(il, im, iu, computeU, firstHouseholderVector, workspace); performFrancisQRStep(il, im, iu, computeU, firstHouseholderVector, workspace);
} }
} }
}
if(iter <= m_maxIterations) if(iter <= m_maxIterations)
m_info = Success; m_info = Success;