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Avoid inefficient 2x2 LU

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Chen-Pang He 2012-09-22 22:06:22 +08:00
parent d7b1049cab
commit 7e64f78f65
1 changed files with 2 additions and 2 deletions
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4
unsupported/Eigen/src/MatrixFunctions/MatrixPower.h
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@ -226,7 +226,7 @@ void MatrixPower<MatrixType>::computeIntPower(const PlainObject& b, ResultType&
else if (p>0) { else if (p>0) {
m_tmp1 = m_A; m_tmp1 = m_A;
} }
else if (b.cols() * (pp - applyings) <= m_A.cols() * squarings) { else if (m_A.cols() > 2 && b.cols()*(pp-applyings) <= m_A.cols()*squarings) {
PartialPivLU<MatrixType> A(m_A); PartialPivLU<MatrixType> A(m_A);
res = A.solve(b); res = A.solve(b);
for (--pp; pp >= 1; --pp) for (--pp; pp >= 1; --pp)
@ -237,7 +237,7 @@ void MatrixPower<MatrixType>::computeIntPower(const PlainObject& b, ResultType&
m_tmp1 = m_A.inverse(); m_tmp1 = m_A.inverse();
} }
while (b.cols() * (pp - applyings) > m_A.cols() * squarings) { while (b.cols()*(pp-applyings) > m_A.cols()*squarings) {
if (std::fmod(pp, 2) >= 1) { if (std::fmod(pp, 2) >= 1) {
apply(b, res, init); apply(b, res, init);
--applyings; --applyings;