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Mesh: [skip ci] fix computation of standard deviation

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This commit is contained in:
wmayer
2020-04-27 17:41:38 +02:00
parent d3c2d11fac
commit bc107eacc8
3 changed files with 11 additions and 10 deletions
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4
src/Mod/Mesh/App/Core/SphereFit.cpp
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@@ -107,7 +107,7 @@ float SphereFit::GetDistanceToSphere(const Base::Vector3f &rcPoint) const
float SphereFit::GetStdDeviation() const
{
// Mean: M=(1/N)*SUM Xi
// Variance: VAR=(N/N-3)*[(1/N)*SUM(Xi^2)-M^2]
// Variance: VAR=(N/N-1)*[(1/N)*SUM(Xi^2)-M^2]
// Standard deviation: SD=SQRT(VAR)
// Standard error of the mean: SE=SD/SQRT(N)
if (!_bIsFitted)
@@ -126,7 +126,7 @@ float SphereFit::GetStdDeviation() const
}
fMean = (1.0f / ulPtCt) * fSumXi;
return sqrt((ulPtCt / (ulPtCt - 3.0f)) * ((1.0f / ulPtCt) * fSumXi2 - fMean * fMean));
return sqrt((ulPtCt / (ulPtCt - 1.0f)) * ((1.0f / ulPtCt) * fSumXi2 - fMean * fMean));
}
void SphereFit::ProjectToSphere()