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Calc: iterative calculation for circular references (Maximum Iterations, Maximum Change)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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neilcawse
2026-10-11 16:39:31 -04:00
co-authored by Claude Opus 5.5
parent 4dca02c89b
commit fdb74c27dd
10 changed files with 408 additions and 62 deletions
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docs/function-parity.md
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@@ -1,6 +1,6 @@
# Function parity: worksheet functions and formulas
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-11 · **Change:** minor (ODDFPRICE, ODDFYIELD, ODDLPRICE, ODDLYIELD added) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-11 · **Change:** minor (iterative calculation for circular references) · **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).
@@ -80,7 +80,7 @@ PIVOTBY, REGEXTEST…) are all present.
| Dynamic arrays, spill, `#SPILL!`, spill operator `A1#` | done; stale-spill bugs (#133, #139; PRs #148, #157) |
| Implicit intersection `@`, legacy CSE array formulas | done; legacy array range fill (PR #156) |
| LET, LAMBDA, named LAMBDAs, ISOMITTED, MAP/REDUCE/SCAN/BYROW/BYCOL/MAKEARRAY | done |
| Iterative calculation for circular references | cycle detection done; the Enable Iterative Calculation setting is stored and saved to XLSX, but the calc engine does not iterate (circular references stay unresolved) |
| Iterative calculation for circular references | done: with Enable Iterative Calculation on (`formulas.calculationOptions` `{iterative, maxIterations, maxChange}`, saved as `<calcPr iterate iterateCount iterateDelta>`), loops are evaluated again from their previous values (blank = 0) until no cell on a loop changes by Maximum Change or Maximum Iterations is reached; off, cycles give `#CIRC!`. Differences: no Options dialog yet (command only); GridCraft recalculates on open, so a loop that never settles (`=A1+1`) advances again each time the file is opened |
| 15-significant-digit comparison semantics | **missing** (#57: `=0.1+0.2=0.3` is FALSE) |
| External workbook references (`[Book.xlsx]Sheet1!A1`) | parsed; links dropped on open, no update |
| Localized function names and `;` separators | **missing** (#45); en-US only |
@@ -103,6 +103,7 @@ workbooks; results checked in as data, not Excel files) and fixing what it finds
| Date | Change | Summary |
|---|---|---|
| 2026-10-11 | minor | Iterative calculation: circular references iterate up to Maximum Iterations / Maximum Change when enabled |
| 2026-10-11 | minor | ODDFPRICE, ODDFYIELD, ODDLPRICE, ODDLYIELD added: Financial 55 / 55; 505 / 523 by name, 496 working |
| 2026-10-11 | minor | PERCENTOF and EUROCONVERT added: 503 / 523 by name, 494 working |
| 2026-10-11 | minor | BAHTTEXT added: 502 / 523 by name, 493 working |