llvm/mlir/test/Integration/data/test.mtx

%%MatrixMarket matrix coordinate real general
%
% This is a test sparse matrix in Matrix Market Exchange Format.
% see https://math.nist.gov/MatrixMarket
%
5 5 9
1 1 1.0
1 4 1.4
2 2 2.0
2 5 2.5
3 3 3.0
4 4 4.0
4 1 4.1
5 5 5.0
5 2 5.2