Generate a Sparse Matrix
Matrix with many zeros. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate a Sparse Matrix
- 1. Set the matrix shape. Enter Rows and Columns for the size you need. Larger matrices make the sparsity pattern, mostly zeros with a few scattered non-zero entries, easier to see.
- 2. Control how many zeros appear. Set Zeros % high, such as 80, to keep most entries at zero, and use Minimum element and Maximum element to bound the range for the non-zero values.
- 3. Choose the element separator. Set Element separator to a space, comma or tab depending on what you are pasting the output into, matching CSV, plain text or spreadsheet conventions.
- 4. Copy the generated matrix. Copy the resulting grid into a sparse matrix library test, a benchmark script or a homework example that needs to demonstrate mostly-zero storage.
When to use Generate a Sparse Matrix
Generate a Sparse Matrix produces a matrix where most entries are zero and only a small percentage hold a random value, the opposite of a dense matrix. It is for exercises, benchmarks and demos that need to show what real-world sparse data, like adjacency matrices or feature matrices, typically looks like.
- Testing sparse matrix storage formats. Compressed sparse row or column storage libraries need a genuinely sparse matrix, with Zeros % set high, to verify the format actually saves space compared to a dense array.
- Simulating a graph adjacency matrix. Real-world graphs, like social networks or web links, produce adjacency matrices that are mostly zero. Generating one at a high zero percentage approximates that structure for a demo.
- Benchmarking sparse versus dense matrix multiplication. Comparing the speed of sparse-aware multiplication against naive dense multiplication requires a matrix that is actually sparse, not just assumed to be, at a controlled zero percentage.
- Teaching when sparse representations make sense. Show a sparse matrix next to a dense one at the same dimensions to make the case for why storage format choice matters for memory-limited applications.
Examples
A 3×3 sparse matrix (about 80% zeros)
Output
0 0 7 0 0 0 5 0 0
Half zeros
Output
6 0 9 0 7 0 0 4 0
About the Generate a Sparse Matrix tool
Generate a Sparse Matrix is a free online tool that works entirely inside your web browser. Matrix with many zeros. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 234 Math utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with 6 settings, including Rows, Columns, Zeros % and Minimum element, 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.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Generate a Sparse Matrix free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Does the generator send anything to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How do I get a different result?
Run the generator again. Each run is computed fresh on your device, and any options you change are applied to the next result immediately.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
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.