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Re:Spreadsheet formulas for personal finance by phonon on Wednesday August 04, 2021 @05:06PM (#28066308)
Have you looked at the "What-if Analysis" functionality in Excel? Scenario Manager and Data Table is designed for that kind of use case (one set of formulas, multiple sets of inputs/scenarios.)

Here are some videos on how to use them.

Data Table https://www.youtube.com/watch?v=y7S9ecg1wdQ

Scenario Manager https://www.youtube.com/watch?v=b_eFIdsV1Bk

Re:Spreadsheet formulas for personal finance by the_fire_friar on Wednesday August 04, 2021 @06:37PM (#28067361)
Those are really cool. I didn't know about them (I was also using Google Sheets :|).

Perhaps because I'm comfortable writing software it still feels very limiting to work within spreadsheets.

Re:Spreadsheet formulas for personal finance by Terretta on Thursday August 05, 2021 @09:23AM (#28073382)
Think of spreadsheets as an IDE for functional programming so your brain treats them as software.

Arguably, the more code works like a spreadsheet (functions transforming values, lists, or matrices) rather than stepwise ‘if this then that’ sequences, the better.

Put another way, logic can be woolier than math, in that concise mathematical formulation tends to removes ambiguity when reasoning over inputs to generate outputs.