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Avoid inefficient 2x2 LU
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@ -226,7 +226,7 @@ void MatrixPower<MatrixType>::computeIntPower(const PlainObject& b, ResultType&
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else if (p>0) {
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m_tmp1 = m_A;
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}
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else if (b.cols() * (pp - applyings) <= m_A.cols() * squarings) {
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else if (m_A.cols() > 2 && b.cols()*(pp-applyings) <= m_A.cols()*squarings) {
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PartialPivLU<MatrixType> A(m_A);
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res = A.solve(b);
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for (--pp; pp >= 1; --pp)
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@ -237,7 +237,7 @@ void MatrixPower<MatrixType>::computeIntPower(const PlainObject& b, ResultType&
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m_tmp1 = m_A.inverse();
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}
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while (b.cols() * (pp - applyings) > m_A.cols() * squarings) {
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while (b.cols()*(pp-applyings) > m_A.cols()*squarings) {
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if (std::fmod(pp, 2) >= 1) {
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apply(b, res, init);
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--applyings;
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