The University of Florida Sparse Matrix Collection

[wxs]

And if you're just in it for the pretty pictures, here are more visualizations of graphs from the dataset by the same guy: http://yifanhu.net/GALLERY/GRAPHS/index1.html

[efremjw]

Just curious, what purpose does this serve/in what applications is this useful?

[AlexeyBrin]

You mean the concept of a sparse matrix ? Well, for e.g. if you use FEM (Finite Element method) you usually end up with a huge linear system which has the nice property that more than 90% of his coefficients are zeros. A sparse matrix will store only the non-zero elements, this is a huge gain from the point of view of memory usage.

Similar considerations applies for using Finite Difference methods.

[zl4000]

I used it for testing Spare Matrix kernels I wrote for my Uni thesis.

However, god knows why this site is considered news worthy. I mean it's the same as it was yesterday, and the day before...

[Serow225]

It's really useful for testing FEA algorithms/code. Tim Davis has done a ton of work developing numerical algorithms for sparse systems, his code is used by software like MATLAB and also bespoke supercomputer systems.

[jayavanth]

Another set http://math.nist.gov/MatrixMarket/collections/hb.html

[rsingla]

This is just stunning.