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

mzechmeister / serval

calculate radial velocities from stellar spectra

MIT License

36 stars 9 forks source link

Open mzechmeister opened 5 years ago

mzechmeister commented 5 years ago

This can happen, if only few data points are available. Low SNR data should not be normalised with a cubic polynomial.

rluquer commented 5 years ago

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

mzechmeister commented 5 years ago

Can you mail me the input command and spectrum list?

mzechmeister commented 5 years ago

For the input you send me, this problem did not occur. I also see you running an older version.