Report Conversion SamosAT DFA-Kernel - AvaFrame: Investigating and comparing differences between com1DFAOrig (SamosAT based) and com1DFA

Wien

2022

27 S.

Monographie

18175BU

40003202

This document shows the comparisons and developments during the conversion from the c++ DFA SamosAT kernel, called com1DFAOrig (com1DFA exectuable on gitea) to the AvaFrame com1DFA python/cython implementation. In a perfect world the results between these two implementations would be exactly the same down to the computational precision. However in real world applications a complete match is impossible, the reasons ranging from different programming languages, slightly different programming of sub-functions and many more. The aim is to show where and how big the differences are between these two modules. We show examples for aspects we explored during the conversion. This includes different categories of sources of uncertainties, be it numerical methods, implementation methods (i.e programming) or input issues. We show that we deem the differences small enough and within acceptable ranges, however we also want to highlight the issues that arise when looking closer and explain their source.