Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...

In this paper we study perturbations of the stiffly weighted pseudoinverse ${\left( {{W^{\frac{1} {2}}}A} \right)^\dag }{W^{\frac{1}{2}}}$ and the related stiffly weighted least squares problem, where ...

A WEIGHT statement names a variable in the input data set with values that are relative weights for a weighted least-squares fit. If the weight value is proportional to the reciprocal of the variance ...