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Calc: INDEX with one index on a 2-D reference is #REF!, as in Excel

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INDEX(A1:C3,2) returned the whole second row. Excel gives #REF! when a
reference has several rows and columns and the column argument is
omitted, so the error also carries into ranges built from it
(A1:INDEX(A1:C3,2)), position arrays (INDEX(A1:C3,{1;2})) and outer
functions. An empty column argument (INDEX(A1:C3,2,)) still gives the
row, and arrays are unchanged: INDEX({1,2;3,4},2) is the row.

Observed in Excel that a column array with one index,
INDEX({10;20;30},2), is a 1x1 array (TYPE 64), which is what calc
already returned; the new test pins it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Harrison Booth
2026-10-15 05:19:32 -05:00
co-authored by Claude Opus 5.5
parent e6b6b34970
commit 6db94d154a
4 changed files with 87 additions and 3 deletions
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ROADMAP.md
+3 -1
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@@ -2,7 +2,7 @@
**Stage: alpha** · next: beta, ~25 points of "ready for real work" and ~160–240 h away
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-12 · **Change:** minor (rows auto-fit oversized fonts on open and whole-row/column formatting) · **Target:** Microsoft Excel (Microsoft 365)
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-15 · **Change:** minor (INDEX with one index on a 2-D reference is #REF! as in Excel) · **Target:** Microsoft Excel (Microsoft 365)
GridCraft aims at full Microsoft Excel parity, and at being better in places: faster, open (XLSX
is the native format), fully scriptable by agents (MCP, control channel, CLI), and on the web.
@@ -132,6 +132,7 @@ Ranked; estimates in Opus 5.5 agent-hours. Detail and the full beta-gate list in
| Date | What landed |
|---|---|
| 2026-10-15 | Calc: `INDEX(A1:C3,2)` (one index on a reference of several rows and columns) is `#REF!` as in Excel, instead of the whole row; `INDEX(A1:C3,2,)` still gives the row |
| 2026-10-12 | Rows auto-fit oversized fonts: opening a file and whole-row/column formatting grow non-custom rows to their tallest font (#833) |
| 2026-10-12 | Number formats: parsing a format code is linear in its length (long runs of `[`, `,` or `/` no longer take quadratic time), and an unclosed `[` is a literal when splitting sections as well as when tokenizing (#810) |
| 2026-10-12 | Number formats: a fraction denominator with 65,536 zeros no longer crashes; format codes are capped at 255 characters like Excel (longer codes display as General, `TEXT` gives `#VALUE!`) (#807) |
@@ -193,6 +194,7 @@ Ranked; estimates in Opus 5.5 agent-hours. Detail and the full beta-gate list in
| Date | Change | Summary |
|---|---|---|
| 2026-10-15 | minor | Progress log: INDEX with one index on a 2-D reference is #REF! |
| 2026-10-12 | minor | Rows auto-fit oversized fonts on open and whole-row/column formatting (#833); progress log row |
| 2026-10-12 | minor | Progress log: multi-area row/column delete (#758) |
| 2026-10-12 | trivial | Progress log: XLSX chart sheets kept on save (#727) |
crates/calc/src/eval.rs
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@@ -1251,7 +1251,13 @@ impl<'h> Evaluator<'h> {
let area = usize::try_from((area_n as u64).saturating_sub(1)).ok();
let Some(a) = area.and_then(|i| areas.get(i)).copied() else { return err(CellError::Ref) };
let r = a.range;
// A single row or column with one index picks along it.
// A single row or column with one index picks along it. An area with several rows
// and columns needs both: `INDEX(A1:C3,2)` is #REF! in Excel (an empty third
// argument, `INDEX(A1:C3,2,)`, still means the whole row). Arrays differ:
// `INDEX({1,2;3,4},2)` is the row.
if two_args && r.height() > 1 && r.width() > 1 {
return err(CellError::Ref);
}
let (row, col) = if two_args && r.height() == 1 { (1, row) } else { (row, col) };
if row as u64 > r.height() as u64 || col as u64 > r.width() as u64 {
return err(CellError::Ref);
crates/calc/src/tests.rs
+75
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@@ -172,6 +172,81 @@ fn index_area_number_overflow() {
}
}
/// INDEX with one index, as observed in Excel: a 2-D reference needs both indexes (#REF!), a
/// column array gives a 1×1 array (TYPE 64), a row array or 1-D reference gives one value.
#[test]
fn index_with_one_index() {
let mut t = T::new();
for (i, v) in [10, 20, 30].iter().enumerate() {
t.set(&format!("A{}", i + 1), &v.to_string());
}
let mut k = 1;
for r in 5..=7 {
for col in ["A", "B", "C"] {
t.set(&format!("{col}{r}"), &k.to_string());
k += 1;
}
}
for (row, (formula, expected)) in [
// Column arrays keep Excel's 1×1 array; row arrays and explicit columns give a value.
("=INDEX({10;20;30},2)", 20.0),
("=TYPE(INDEX({10;20;30},2))", 64.0),
("=TYPE(INDEX(SEQUENCE(3),2))", 64.0),
("=TYPE(INDEX({10;20;30},2,1))", 1.0),
("=TYPE(INDEX({10,20,30},2))", 1.0),
("=TYPE(INDEX(INDEX({10;20;30},2),1))", 1.0),
("=SUM(INDEX({10;20;30},2))", 20.0),
// 1-D references with one index are single-cell references.
("=TYPE(INDEX(A1:A3,2))", 1.0),
("=SUM(INDEX(A1:A3,1):INDEX(A1:A3,3))", 60.0),
("=SUM(INDEX((A1:A3,A5:C7),2))", 20.0),
// A 2-D array with one index is the row.
("=SUM(INDEX({1,2;3,4},2))", 7.0),
("=SUM(INDEX({1,2;3,4},0))", 10.0),
// A 2-D reference with an empty (not omitted) column argument is the row.
("=SUM(INDEX(A5:C7,2,))", 15.0),
("=SUM(INDEX(A5:C7,2,,1))", 15.0),
("=COLUMNS(INDEX((A1:A3,A5:C7),2,,2))", 3.0),
("=INDEX(A5:C7,2,2)", 5.0),
// A 2-D reference with one index is #REF!, and the error carries through.
("=TYPE(INDEX(A5:C7,2))", 16.0),
("=ISREF(INDEX(A5:C7,2))", 0.0),
]
.iter()
.enumerate()
{
let at = format!("J{}", row * 4 + 1);
t.set(&at, formula);
let got = match t.get(&at) {
Value::Bool(b) => f64::from(u8::from(b)),
v => v.as_f64().unwrap_or_else(|| panic!("{formula} = {v:?}")),
};
assert_eq!(got, *expected, "{formula}");
}
for formula in [
"=INDEX(A5:C7,2)",
"=INDEX(A5:C7,0)",
"=INDEX(A5:C7,1.9)",
"=INDEX(A5:C7,)",
"=INDEX(A5:B6,1)",
"=INDEX(A5:C7,2)+1",
"=SUM(INDEX(A5:C7,{1;2}))",
"=ROWS(INDEX(INDEX(A5:C7,2),3))",
"=SUM(A5:INDEX(A5:C7,2))",
"=SUM(INDEX(A5:C7,2):C7)",
] {
t.set("L1", formula);
assert_eq!(t.get("L1"), Value::Error(CellError::Ref), "{formula}");
}
t.set("L1", "=INDEX(A5:C7,{1;2})");
assert_eq!([t.get("L1"), t.get("L2")], [Value::Error(CellError::Ref), Value::Error(CellError::Ref)]);
t.set("L1", "=IFERROR(INDEX(A5:C7,2),\"e\")");
assert_eq!(t.get("L1"), Value::from("e"));
// A bad position is still #VALUE!.
t.set("L1", "=INDEX(A5:C7,\"x\")");
assert_eq!(t.get("L1"), Value::Error(CellError::Value));
}
#[test]
fn errors_and_cycles() {
let mut t = T::new();
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:** 2026-10-12 · **Change:** minor (USDOLLAR added as a compatibility function; MIRR, COUNTIF and INDIRECT edge cases match Excel 365) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-10-15 · **Change:** minor (INDEX with one index on a reference of several rows and columns is #REF! as in Excel) · **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).
@@ -108,6 +108,7 @@ workbooks; results checked in as data, not Excel files) and fixing what it finds
| Date | Change | Summary |
|---|---|---|
| 2026-10-15 | 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 |
| 2026-10-12 | minor | USDOLLAR added as a Compatibility function (not on Microsoft's list, so the counts don't change); MIRR with no positive flow is -1, COUNTIF's bare `"<="` / `">="` skip empty strings, INDIRECT with `a1` = FALSE gives `#REF!` for A1-style text (#738) |
| 2026-10-11 | minor | TEXT / number formats fixed against Excel-cached results: fraction literals and zero fractions, `0` denominators zero padded, `?` pads the thousands separator, booleans use the text section (226 mismatches → 0 in 352 TEXT cells) |
| 2026-10-11 | minor | Iterative calculation: circular references iterate up to Maximum Iterations / Maximum Change when enabled |