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bug #977: add stableNormalize[d] methods: they are analogues to normalize[d] but with carefull handling of under/over-flow

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This commit is contained in:
Gael Guennebaud
2016-01-23 22:40:11 +01:00
parent 369d6d1ae3
commit 1cf85bd875
3 changed files with 62 additions and 0 deletions
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14
test/stable_norm.cpp
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@@ -163,6 +163,20 @@ template<typename MatrixType> void stable_norm(const MatrixType& m)
VERIFY(!(numext::isfinite)(v.blueNorm())); VERIFY((numext::isnan)(v.blueNorm()));
VERIFY(!(numext::isfinite)(v.hypotNorm())); VERIFY((numext::isnan)(v.hypotNorm()));
}
// stableNormalize[d]
{
VERIFY_IS_APPROX(vrand.stableNormalized(), vrand.normalized());
MatrixType vcopy(vrand);
vcopy.stableNormalize();
VERIFY_IS_APPROX(vcopy, vrand.normalized());
VERIFY_IS_APPROX((vrand.stableNormalized()).norm(), RealScalar(1));
VERIFY_IS_APPROX(vcopy.norm(), RealScalar(1));
VERIFY_IS_APPROX((vbig.stableNormalized()).norm(), RealScalar(1));
VERIFY_IS_APPROX((vsmall.stableNormalized()).norm(), RealScalar(1));
VERIFY_IS_APPROX(vbig, vbig.stableNorm() * vbig.stableNormalized());
VERIFY_IS_APPROX(vsmall, vsmall.stableNorm() * vsmall.stableNormalized());
}
}
void test_stable_norm()