XLOOKUP returned only values, so it couldn't end a range or feed
functions that need a reference: SUM(XLOOKUP("b",A1:A4,B1:B4):
XLOOKUP("d",A1:A4,B1:B4)) and SUM(B1:XLOOKUP(…)) gave #VALUE!, and so
did CELL("address",XLOOKUP(…)). A match on an empty cell gave 0, so
ISBLANK(XLOOKUP(…)) was FALSE and "x"&XLOOKUP(…) gave "x0" (#374). In
Excel XLOOKUP returns a reference to the matching row (or column) of
its result range. The evaluator now does so, finding the position with
XMATCH; arrays of lookup values, array arguments and errors still go
through the library function.
A name whose references have no $ was evaluated as if they were
absolute. In Excel such references are relative: defined from B2,
=Sheet1!A2 means "the cell to the left", and the file stores it
relative to A1 (Sheet1!XFD1, wrapping around the sheet's edge).
Name formulas with relative references are now moved by the using
cell's offset from A1, wrapping at the edges, and formulas.defineName
takes relative references as relative to the active cell, as Excel's
Name Manager does, and stores them relative to A1.
INDEX took one row and one column number, so INDEX(A1:C3,{1;3},{1,3})
gave a single value and SUM(INDEX(A1:C3,{1,2,3},2)) summed one cell.
In Excel, arrays of positions return an array of the values at each
(broadcast) position. A position that picks a whole row or column gives
#CALC! there, as arrays can't nest.
Evaluator special form returning the range (or array) without its blank
outer rows and columns; trim codes 0-3 as documented; written as
_xlfn.TRIMRANGE. The trim-reference operators are not parsed yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The evaluator took a single index, so CHOOSE({1,2},"a","b") gave "a"
and VLOOKUP(x,CHOOSE({1,2},B1:B3,A1:A3),2,FALSE) gave #REF!. An array
index now goes through the library CHOOSE, which lifts over its
arguments as Excel does.
Excel doesn't support spilled arrays in tables: a formula such as
=SEQUENCE(2) entered in a table cell shows #SPILL! ("Spill range in
table"). GridCraft spilled it over the table's cells. An array whose
formula is in a table is now blocked, both when it is computed and when
it is written back.
A dynamic array that couldn't spill was only rejected when results were
written back, after formulas evaluated later in the same pass had read
the array as if it had spilled. With 1s in A1:C3 except B2 =
SEQUENCE(2,2,9) (blocked), =SUM(A1:C3) gave 47 after a full
recalculation (opening a file, Calculate Now) instead of #SPILL!; a
reader through OFFSET kept the wrong value even when entered one cell
at a time. The spill area is now checked as soon as the array is
computed, so the anchor is #SPILL! for everything after it.
A formula's result that is a blank cell shows 0, but blanks inside an
array result spilled as blank cells: =A1:A3, or FILTER or SORT of a
range with blanks, left empty cells that ISBLANK saw as blank and
COUNT skipped. Excel shows 0 in each. GROUPBY and PIVOTBY keep the
blank cells of their own layout.
A multi-cell reference was read only up to the sheet's used range, so
the array it gave depended on what else was on the sheet:
ROWS(A1:A10*1), COUNTBLANK(A1:A10) and SUMPRODUCT(--(A1:A10="")) came
out smaller than in Excel, and changed as cells were entered elsewhere
without the formula recalculating. References of up to 16,384 cells now
keep their size; larger ones (A:A, ranges reserved for data to come
such as $A$2:$A$50000) still stop at the used range, so that formulas
over them stay fast.
A Ctrl+Shift+Enter array formula was evaluated like a dynamic array:
- Read from a file, the cached values in its range were kept as
constants, so the formula showed #SPILL! (any multi-cell array
formula saved by Excel or LibreOffice).
- Entered over C2:C4 with a two-value result, C4 stayed blank where
Excel shows #N/A, and a single-cell array formula spilled.
- On save, the values of its other cells were not cached.
The result is now fitted to the range: a single row or column repeats
across it, cells past the result show #N/A, and a larger result is cut
off. Reading drops the cached values inside the range, entering clears
the range, and saving caches its values. The formula bar shows the
formula in braces, {=B2:B3*2}.
formula::parse("Sheet1!$D$1#") failed with "unknown error literal".
A # right after a cell reference is now the spill range operator: it
evaluates to the anchor's current spill range, or #REF! when the cell
doesn't spill (or its spill is blocked). Its users depend on the
anchor, so they recalculate when the spill grows or shrinks. Names can
use it.
Files have no # operator: like Excel, the writer stores A1# as
_xlfn.ANCHORARRAY(A1), and the parser reads that back as A1#.
Excel adds up the range that starts at sum_range's top-left cell and has
the criteria range's height and width, whatever size sum_range has. With
A1:B3 = a,1 / b,2 / a,3, =SUMIF(A1:A3,"a",B1) is 4; GridCraft gave 1,
because if_numbers only saw sum_range's values (one cell) and read them
at the criteria positions. Its comment promised the resizing, but by then
the argument was a plain value.
The evaluator has the references, so it now does the resizing, as it does
for OFFSET and INDEX: for SUMIF and AVERAGEIF with three arguments, a
single-area sum range reference becomes resized_sum_range(sum, criteria
height, criteria width), cut off at the sheet's edge. It works across
sheets and through names. The dependency graph records the resized
range, so editing a cell inside it recalculates; when the criteria range
isn't a plain reference the formula is recalculated every time instead.
SUMIFS and AVERAGEIFS keep requiring same-size ranges (#VALUE!
otherwise).
Tests: a single-cell, shorter, wider, longer and horizontal sum range,
whole-column criteria, editing a cell of the resized range, the sheet
edge, another sheet and a defined name, and SUMIFS/AVERAGEIFS size
mismatches. They fail before the fix (1 instead of 4).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- ui-egui: title bar with QAT, full ribbon (Home/Insert/Draw/Page Layout/Formulas/Data/
Review/View/Automate + Table/Chart Design), formula bar with Name Box, virtualised grid
(frozen panes, overflow, borders, CF data bars/scales/icons, tables, sparklines, filter
buttons, charts/pictures/shapes), in-cell editor with point mode, reference colouring,
autocomplete and argument hints, sheet tabs, status bar, dialogs, control channel
- apps/sheetcraft: desktop app (control server, file dialogs, prefs, drag & drop)
- chart: toolkit-free chart layout/rendering for 25 chart kinds + sparklines + rasteriser
- mcp + sheetcraft-cli: MCP server (headless or bridged) and CLI (info/convert/eval/cat/run/mcp)
- xtask (ci/layers/assets/wasm/version/parity), release workflows, packaging, placeholder icon
- automatic row heights
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Brandon Thomas
nihilist-narwhal
Sasha Syrotenko
vangel76
lloyd