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fix bad fuzzy comparison in 3x3 tridiagonalization

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This commit is contained in:
Gael Guennebaud 2010-07-16 16:38:58 +02:00
parent 044424b0e2
commit 6ab9e8632f
1 changed files with 4 additions and 4 deletions
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4
Eigen/src/Eigenvalues/Tridiagonalization.h
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@ -458,7 +458,7 @@ struct ei_tridiagonalization_inplace_selector
};
/** \internal
* Specialization for 3x3 matrices.
* Specialization for 3x3 real matrices.
* Especially useful for plane fitting.
*/
template<typename MatrixType>
@ -472,7 +472,7 @@ struct ei_tridiagonalization_inplace_selector<MatrixType,3>
{
diag[0] = ei_real(mat(0,0));
RealScalar v1norm2 = ei_abs2(mat(2,0));
if (ei_isMuchSmallerThan(v1norm2, RealScalar(1)))
if(v1norm2 == RealScalar(0) && ei_imag(mat(1,0))==RealScalar(0))
{
diag[1] = ei_real(mat(1,1));
diag[2] = ei_real(mat(2,2));