The matrix market exchange formats:
Ronald F. Boisvert, Roldan Pozo, Karin Remington · 1996
We propose elementary ASCII exchange formats for matrices.Specific instances of the format are defined for dense and sparse matrices with real, complex, integer and pattern entries, with special cases for symmetric, skew-symmetric and Hermitian matrices.Sparse matrices are represented in a coordinate storage format.The overall file structure is designed to allow future definition of other specialized matrix formats, as well as for objects other than matrices.