LibreOffice Calc · References and calculation · Intermediate
Create editable array-formula results safely
Create editable array-formula results safely. A controlled example with expected outcomes, changed-input checks and recovery.
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An array formula applies one calculation to a whole result block. In Calc, create it with Ctrl+Shift+Enter, and edit the complete result range rather than overwriting one result cell. This is an array-range workflow, not a promise of Excel-style dynamic spilling.
Build a small conversion block
Use LibreOffice Calc 26.2 desktop with English standard menus on Windows or Linux. Save a disposable ODS workbook. The procedure is based on the 26.2 guide; native execution and screenshots have not been verified for this tutorial.
Enter 2 and 5 in A1:B1, 3 and 0 in A2:B2, and 4 and 7 in A3:B3. Leave D1:E3 empty. Put the label Converted values, factor 10 in D5, outside the future output. Keep source and result ranges separate so the formula never refers to its own output.
The expected result block is:
| Row | D | E |
|---|---|---|
| 1 | 20 | 50 |
| 2 | 30 | 0 |
| 3 | 40 | 70 |
Enter the array once
- Select D1:E3, exactly three rows by two columns.
- Type
=10*A1:B3in the input line. - Confirm with Ctrl+Shift+Enter, not Enter alone.
- Select a result cell and inspect the formula bar. Calc displays the array formula with braces. Do not type those braces yourself: braces are a consequence of array entry, not the entry method.
- Compare all six results with the table. A plausible upper-left value alone is not a successful check.
The source zero is intentional. It should produce zero rather than a blank or an omitted output cell. If only one result appears, undo the attempted entry and repeat with the intended rectangle and array confirmation. The Function Wizard also has an Array checkbox, but this exercise uses direct entry so the confirmation step is explicit.
Change data, then change the calculation
Replace A2 with 6. D2 should become 60 while the other five results stay unchanged. This checks that the output remains linked to its input rather than being pasted numbers.
To change the multiplier, select the entire D1:E3 result range, edit the formula to =12*A1:B3, and confirm again with Ctrl+Shift+Enter. With A2 still 6, expect rows 24/60, 72/0, and 48/84. Update the explanatory label to factor 12. A label that still says 10 makes a numerically correct block misleading.
Do not replace E2 with a special-case number. Calc protects the cells belonging to an array against partial changes. Put exceptions in the input data or redesign the calculation, rather than trying to break one cell out of the result block.
Recover and preserve the result
If the output has the wrong dimensions, keep a copy of the formula, select the complete existing array, and clear the whole result block before recreating it in an empty rectangle of the correct size. Do not clear a larger area containing unrelated work. Undo is useful immediately after a mistaken operation, but the saved practice copy is the safer recovery point after several edits.
Save as ODS, close, and reopen. Check the six values, the factor label, and the array formula. Then change B3 from 7 to 8: E3 should become 96 with factor 12. This is a more useful persistence check than simply seeing the old cached numbers.
For reference behavior outside arrays, see absolute and relative cell references. A new input row is not automatically permission to overwrite adjacent cells: deliberately rebuild the output range when the model expands.