My first thought was to upload the PDF to Qwen3 and ask it to reimplement in Python using NumPy, Astropy, etc. Have to work on the day job, but could be some educational fun learning and Jupyter plots in my near future. Anyway, the generated code looks promising and contains the requisite green tick and bar graph emojis, so what's not to like?
Scipy implements similar algorithms, but delegates the heavy lifting to - you guessed it - Fortran. Example: https://github.com/scipy/scipy/blob/v1.16.1/scipy/integrate/...
The combination of Fortran and AI here starts to be close to 2001. ;)
You mean 2001 of 1969?
The X-files AI episodes of the '90's are about as close to 1969 as to today.
All anybody could do then was to use their imagination, but is it all that much different today?