Tim Davis, the developer of SuiteSparse [1], a library for calculating with sparse matrices, also developed a reference implementation of GraphBLAS. On his blog

Tim Davis, the developer of SuiteSparse [1], a library for calculating with sparse matrices, also developed a reference implementation of GraphBLAS. On his blog are a few short examples of how it looks when you call it from MATLAB: http://aldenmath.com/performance-of-the-matlab-interface-to-suitesparsegraphblas/ http://aldenmath.com/performance-of-the-matlab-interface-to-... http://aldenmath.com/a-matlab-interface-for-suitesparsegraphblas/ http://aldenmath.com/a-matlab-interface-for-suitesparsegraph... [1] http://faculty.cse.tamu.edu/davis/suitesparse.html http://faculty.cse.tamu.edu/davis/suitesparse.html