Regarding the matrix operations which calculate the actual coefficients used in the X and Y axis of the PER biplots, I wonder if there is an excel spreadsheet to calculate the coefficients of Pearce element ratios diagrams?

I am talking about the actual calculation of the coefficients based on the matrix algebra operations, starting from scratch and not only a spreadsheet that calculate the X and Y  values based on a preexisting set of vectors.

Is there an excel file for this purpose or is there a more sophisticated software.

If there is an excel file is it possible to share with me the spreadsheet used for that purpose?

If a different software and algorithm is available, how can it be obtained?

Thank you in advance