Hi, The part "More complicated but very general solution" of the answer https://emacs.stackexchange.com/a/46862/2370 on Emacs SE defines input and output filters for table formulas. The input filter filters the arguments before construction of the calc equation. The output filter filters the calc result before printing it into the target cell. In the SE answer the filters are used to convert between the calc duration syntax h@ m' s" and the duration syntax hh:mm:ss. The filters could be a useful extension of org table formula modes.
Best regards, Tobias
