Error with covariance matrix

_ROOT Version:5.34
Hi, I have some points and each points has error bar. I fit a second-order line on these points. I find the middle point on this line, to find the error of this point how can I use the covariance matrix? I don’t know anything about the covariance matrix, I only know I can use covariance matrix of the fit parameters to find the error of the point.

Hi @hajar,
as this question is not strictly ROOT-related, you might get lucky and get an answer here, but it’s possible that would turn out to be a better platform for this topic.

All the best!

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