https://bugs.documentfoundation.org/show_bug.cgi?id=149333

--- Comment #5 from Mike Kaganski <[email protected]> ---
Maybe the easiest example (inspired by bug 161338):

A1: 200
A2: =1/A1

Goal Seek
Formula cell: $A$2
Target value: 100
Variable cell: $A$1

The method used in ScDocument::Solver (sc/source/core/data/documen4.cxx),
Regula Falsi, is known to have limitations for discontinuous functions (like
the cases mentioned here). Some improvements are needed to overcome the
limitations. Excel's Goal Seek converges much slower in these cases, compared
to instant failure of Calc; it looks OK to try to introduce additional steps
(alternative methods? more clever detection of special points?) here, if that
helps.

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