T.DIST takes 3 parameters. When the 3rd parameter, a boolean, is true, we now have code to support the request. We still do not have code to handle the false case.
Fix#4167. That problem was initially reported as a problem with TINV, however, at its root, it was actually a problem with TDIST (which TINV needs to call). Both of these are deprecated by Microsoft in favor of some newer functions. PhpSpreadsheet incorrectly treated T.INV as an alias for TINV, and did not implement T.INV.2T, which actually is an alias for TINV.
To solve this problem, I adapted the Perl CPAN module `Statistics::Disttributions`, written by Michael Kospach around 2003. Unit test results have been manually checked against Excel; a few had to be changed because they were wrong (see the original issue). I believe that all of TDIST, T.DIST.2T, T.DIST.RT, TINV, T.INV, and T.INV.2T now function correctly, at least most of the time. I have not found code or an algorithm that I can use for T.DIST nor for T.TEST, both of which remain unimplemented.
Fix#3255, another oldie (3+ years). Allow the ability to only count rows and columns with data. To avoid a breaking change, keep present logic unless Reader `readEmptyCells` attribute is set to its non-default value, i.e. `false`. This adds very little overhead, and gives a result that I think many users would prefer.
Current tests use only direct calls. Using them in spreadsheet context would be better.
There were some minor bugs. Excel treats an argument consisting of a single-cell as if it were a range; PhpSpreadsheet, which currently returns the content of the single cell, is changed to match that behavior, which is important if one of the other arguments causes a VALUE error.
Excel can do a column sort in SORTBY, despite the fact that Microsoft doesn't even mention that possibility in its documentation. I found documentation of that possibility on a 3rd-part site https://exceljet.net/functions/sortby-function, confirmed it in Excel, and took my best guess as to how to implement it. The existing test member for SORTBY included one such test, but it succeeds mostly by accident. The new member has a more reliable test.
The tests stay; they just no longer run in separate processes. I think that only 2 tests still require separate processes - Helper/SampleTest and Tcpdf/NoDieTest. Aside from a new internal method in IOFactory, all the changes here are to test members.
oleibman
Reinis Grinbergs
zhukoff74
zhukoff