Delete Matrix Columns
Remove columns from a matrix. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Delete Matrix Columns
- 1. Paste your matrix. Enter a matrix in the input pane, one row per line, with the columns you plan to remove clearly present in the data.
- 2. Specify which columns to delete. Enter column numbers in the Columns field, such as 1 or 1,3, to mark which columns should be dropped from every row of the matrix.
- 3. Set the element separator. Use Element separator to match how numbers within a row are divided in your input, ensuring the tool splits each row correctly before removing columns.
- 4. Copy the reduced matrix. Copy the resulting matrix, with the specified columns removed and the remaining columns shifted left, into your script or spreadsheet.
When to use Delete Matrix Columns
Delete Matrix Columns removes one or more columns from a matrix by position, shifting the remaining columns left. It handles the tedious part of trimming down a dataset without rewriting every row by hand.
- Dropping an unused feature column. A dataset exported as a matrix includes an ID column you do not need for a calculation, and deleting that column leaves only the numeric features you actually use.
- Reducing a matrix for a smaller example. You are simplifying a worked linear algebra example and want to drop the last column of a matrix to turn it into a smaller, easier-to-follow illustration.
- Removing a redundant column before inverting. A matrix has two columns that are exact duplicates, causing a singular matrix, and deleting one of them lets the remaining matrix be inverted successfully.
- Trimming a matrix to match another's shape. Two matrices need matching dimensions to be multiplied together, and deleting extra columns from one of them brings the shapes into alignment.
Examples
Delete the first column
Input
1 2 3 4 5 6
Output
2 3 5 6
Delete columns 2-3
Input
1 2 3 4 5 6 7 8
Output
1 4 5 8
About the Delete Matrix Columns tool
Delete Matrix Columns runs as plain JavaScript in your browser tab, with no server behind it. Remove columns from a matrix. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Math Tools section, 234 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with 2 settings, including Columns and Element separator, and the result refreshes the moment you change one. 2 worked examples further down the page show exactly what the tool produces for real inputs.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Delete Matrix Columns cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.