I'm interested in a serial implementation of fox's algorithm for memory management reasons. Does anybody know if there is anything available in R or C libraries? [eg A %*% B is too big to allocate memory for. I really want the values written to disk, so I was thinking that it would be easiest to use something like Fox's algorithm to load submatrices/blocks of A and B iteratively, do the multiplies, write to disk, and repeat to get the rest of the submatrices of A%*%B. If A and B were sufficiently sparse, I would use spam... Best, Blair