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Reduce explicit zeros when applying SparseQR's matrix Q

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Gael Guennebaud
2013-09-20 23:28:10 +02:00
parent 4bb1c48f25
commit 00dc45d0f9
1 changed files with 2 additions and 0 deletions
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2
Eigen/src/SparseQR/SparseQR.h
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@@ -573,6 +573,7 @@ struct SparseQR_QProduct : ReturnByValue<SparseQR_QProduct<SparseQRType, Derived
{
Scalar tau = Scalar(0);
tau = m_qr.m_Q.col(k).dot(res.col(j));
if(tau==Scalar(0)) continue;
tau = tau * m_qr.m_hcoeffs(k);
res.col(j) -= tau * m_qr.m_Q.col(k);
}
@@ -588,6 +589,7 @@ struct SparseQR_QProduct : ReturnByValue<SparseQR_QProduct<SparseQRType, Derived
{
Scalar tau = Scalar(0);
tau = m_qr.m_Q.col(k).dot(res.col(j));
if(tau==Scalar(0)) continue;
tau = tau * m_qr.m_hcoeffs(k);
res.col(j) -= tau * m_qr.m_Q.col(k);
}