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WARNING: Matrix is not positive definite. Zero or negative yerr values for 0 at [] #25

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mzechmeister opened this issue Apr 2, 2019 · 3 comments
Open

WARNING: Matrix is not positive definite. Zero or negative yerr values for 0 at [] #25

mzechmeister opened this issue Apr 2, 2019 · 3 comments

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@mzechmeister
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This can happen, if only few data points are available. Low SNR data should not be normalised with a cubic polynomial.
@rluquer
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rluquer commented May 25, 2019

Sometimes even using -pspline option the error persists and no RVs are computed. Any suggestion?

@mzechmeister
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Can you mail me the input command and spectrum list?

@mzechmeister
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mzechmeister commented May 29, 2019 •
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For the input you send me, this problem did not occur.
I also see you running an older version.

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@rluquer @mzechmeister