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G719: return NA for empty harmonic mean input

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Harrison Booth
2026-10-30 20:25:09 -05:00
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3 changed files with 23 additions and 2 deletions
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docs/function-parity.md
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# Function parity: worksheet functions and formulas
> **Last reviewed:** 2026-10-15 · **Last updated:** 2026-10-25 · **Change:** minor (the LAMBDA row lists the recursion limit and its `#NUM!`, and the error a defined name holding an error gives when called; earlier: number text with accounting parentheses coerces like Excel 365; INDEX with one index on a 2-D reference is #REF! as in Excel; earlier: SUBTOTAL and AGGREGATE cap the cells they visit, #2175) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-31 · **Last updated:** 2026-10-31 · **Change:** minor (HARMEAN returns `#N/A` when its arguments contain no numeric observations) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
Excel's worksheet functions, category by category, against GridCraft's function library. Part of
[target-app-parity.md](target-app-parity.md); gaps feed [gaps.md](gaps.md).
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## Depth (estimated)
| Function | Excel parity note |
|---|---|
| HARMEAN | Returns `#N/A` when arrays and references contain no numeric observations; zero and negative numeric observations still return `#NUM!`. |
**~82% ready.** The library is broad and has 96 test functions in `crates/functions` with many
assertions each, but there is no conformance suite against Excel-computed results, and user
reports keep finding edge cases: MIN() with no arguments (#138), COUNTBLANK past the used range
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| Date | Change | Summary |
|---|---|---|
| 2026-10-31 | minor | HARMEAN returns `#N/A` when array or reference inputs contain no numbers; nonpositive numeric observations remain `#NUM!` |
| 2026-10-25 | minor | LAMBDA row: a LAMBDA that calls itself more than 140 times, and a formula nested past the depth limit, give `#NUM!` (#1809; nesting gave `#CALC!` before). `=Foo(1)` where the defined name Foo holds `#N/A` gives `#N/A`, not `#NAME?` |
| 2026-10-23 | minor | Number text coercion (VALUE, arithmetic, typed entry): a dollar sign before accounting parentheses (`$(1,234)`, `$ (5)`) and a percent sign after them (`(5)%`) read as negatives; `(-5)`, `((5))`, `($-5)`, `$5%`, `$(5)%` and dates or times in parentheses are `#VALUE!`, as observed in Excel 365 |
| 2026-10-23 | minor | INDEX with only a row index on a reference of several rows and columns (`INDEX(A1:C3,2)`, `INDEX(A1:C3,0)`) is `#REF!`, as observed in Excel, so it also fails as a range endpoint and inside other functions; an empty column argument (`INDEX(A1:C3,2,)`) still gives the row. Checked that a column array with one index stays a 1×1 array (`TYPE` 64), which is what Excel returns |