My matrices are dense. I’m working with boundary elements. But, there are sparse optimized libraries for efficient storage and access to sparse matrices (e.g.:

My matrices are dense. I’m working with boundary elements. But, there are sparse optimized libraries for efficient storage and access to sparse matrices (e.g.: Eigen has both sparse and dense sub-libraries). Also, there’s a whole literature concerned with sparse matrices and operations on those. However, my knowledge is limited on sparse side. If you want, I might try to dig into it a bit.