How to Flatten a Two-Dimensional Excel Grid into a Dynamic List
Question details
The user needs to convert a large two-dimensional relationship matrix in Excel into a dynamic list that extracts related values for each category and updates automatically when the matrix data changes.
- Product
- Excel
- Device & OS
- not provided
- Scenario
- Restructuring and organizing a complex relationship matrix into a simplified, automated list for better data analysis and reporting.
- Observed behavior
- The goal state is a responsive list where any added or removed markers in the original two-dimensional grid are instantly reflected in the flattened list without manual intervention.
Ensure you are using a version of Excel that supports dynamic array functions, such as Microsoft 365 or Excel 2021. If you are using an older version, you may need to rely on VBA or Power Query to achieve similar results.
Use Dynamic Array Functions (FILTER and TEXTJOIN)
The most efficient way to flatten a grid into a dynamically updating list is by combining modern array functions to look up markers and combine corresponding headers.
By utilizing the FILTER function alongside TEXTJOIN, you can instruct Excel to look across a specific row for grid markers and return only the column headers where a marker exists. This method ensures your list is entirely dynamic and recalculates instantly when grid values are modified.
Locate your grid's column headers (e.g., Row 1 from B1 to Z1) and the data rows where relationship markers are placed (e.g., Row 2 from B2 to Z2).
In your target destination cell, type the FILTER function to extract the column headers where the row contains a marker. For example: =FILTER($B$1:$Z$1, B2:Z2<>"")
To output these multiple matches into a single, clean list separated by commas, wrap your FILTER formula inside a TEXTJOIN function: =TEXTJOIN(", ", TRUE, FILTER($B$1:$Z$1, B2:Z2<>""))
Press Enter to execute the formula, then click and drag the fill handle down the column to apply this logic to all categories in your matrix.
Use Power Query to Unpivot Data
For users managing massive datasets or requiring a vertical tabular format rather than comma-separated strings, Power Query's Unpivot feature is an excellent built-in alternative.
Implement a VBA Macro for Legacy Versions
If you are using Excel 2016 or older and cannot use Power Query or dynamic arrays, a custom VBA script can systematically flatten the grid.
Flatten Complex Data Grids Easily in WPS Office
WPS Spreadsheet fully supports modern dynamic array functions like FILTER and TEXTJOIN. You can effortlessly manage, filter, and restructure complex relationship matrices into clean, dynamic lists without needing complicated VBA code or external tools.
- 1. Open your matrix in WPS Office: Launch WPS Spreadsheet and open the file containing your two-dimensional grid.
- 2. Select the target cell: Click on the cell where you want your new dynamic list to populate.
- 3. Input the dynamic formula: Type your combined =TEXTJOIN and =FILTER formula, referencing your grid's headers and rows.
- 4. Apply and drag: Hit Enter to see the flattened result, then drag the fill handle downwards to complete the dynamic list for all entries.
Frequently Asked Questions
What is a dynamic array function?
Dynamic array functions, such as FILTER, SORT, and UNIQUE, are modern spreadsheet features that allow a single formula to return multiple values. Instead of needing to copy a formula across many cells, the results automatically 'spill' into adjacent empty cells, making complex data manipulation tasks much simpler.
Why is my FILTER function returning a #CALC! error?
The #CALC! error typically occurs when the FILTER function searches the grid but finds no matching records (e.g., a row has no markers), and the [if_empty] argument has been left blank. You can fix this by providing a fallback value at the end of your formula, like this: =FILTER(array, include, "No match").
Will my dynamic list update automatically if I add new columns to the grid?
Formulas only update automatically if the new columns fall within the originally defined range. To make it truly dynamic so it accounts for new columns, you should format your original two-dimensional grid as an official Table (Ctrl+T). The formula references will then automatically expand as new columns are added.
Does WPS Office support these advanced functions?
Yes, WPS Spreadsheet has been updated to support modern dynamic array functions, including FILTER, UNIQUE, and TEXTJOIN. Your formulas will work natively and you can import Excel files without worrying about compatibility issues.
