Dear Micha,

I hope you are doing well.

First of all, I would like to thank you for the excellent software you have developed. JAG3D has been a great help to me in my research, and I really appreciate the work and effort that you have put into developing it.

I am currently working with JAG3D 2026 and I would like to obtain the actual matrices used internally during the least-squares adjustment.

Specifically, I am looking for the design/Jacobian matrix 𝐴,the weight matrix 𝑃 and, if possible, the normal equation matrix 𝑁.

I am not looking for the posterior variance-covariance matrix of the adjusted parameters. I need the actual 𝐴 and 𝑃 matrices used during the adjustment, with the same row and column ordering as used internally by JAG3D.

Is there a way to export these matrices from JAG3D 2026, or are they stored somewhere in the HSQLDB project database?

If they are not stored in the database, could you please point me to the Java class or method in the source code where these matrices are formed? I would like to extract them for further analysis as part of my research.

Thank you very much for your time and for developing JAG3D.

Best regards,

Nemanja